2x - 4b + 7a + 5c

Assuming the given expression is part of an equation set to zero, $2x - 4b + 7a + 5c = 0$, we can solve for each variable in terms of the others.

Step 1: Solve for $x$. Start with the equation: $2x - 4b + 7a + 5c = 0$ Isolate the term with $x$ by moving the other terms to the right side: $2x = 4b - 7a - 5c$ Divide both sides by $2$: $x = \frac{4b - 7a - 5c}{2}$ $x = 2b - \frac{7}{2}a - \frac{5}{2}c$

Step 2: Solve for $b$. Start with the equation: $2x - 4b + 7a + 5c = 0$ Isolate the term with $b$ by moving the other terms to the right side: $-4b = -2x - 7a - 5c$ Multiply both sides by $-1$ to make the $b$ term positive: $4b = 2x + 7a + 5c$ Divide both sides by $4$: $b = \frac{2x + 7a + 5c}{4}$ $b = \frac{1}{2}x + \frac{7}{4}a + \frac{5}{4}c$

Step 3: Solve for $a$. Start with the equation: $2x - 4b + 7a + 5c = 0$ Isolate the term with $a$ by moving the other terms to the right side: $7a = -2x + 4b - 5c$ Divide both sides by $7$: $a = \frac{-2x + 4b - 5c}{7}$ $a = -\frac{2}{7}x + \frac{4}{7}b - \frac{5}{7}c$

Step 4: Solve for $c$. Start with the equation: $2x - 4b + 7a + 5c = 0$ Isolate the term with $c$ by moving the other terms to the right side: $5c = -2x + 4b - 7a$ Divide both sides by $5$: $c = \frac{-2x + 4b - 7a}{5}$ $c = -\frac{2}{5}x + \frac{4}{5}b - \frac{7}{5}a$

The solutions are: $\boxed{x = 2b - \frac{7}{2}a - \frac{5}{2}c}$ $\boxed{b = \frac{1}{2}x + \frac{7}{4}a + \frac{5}{4}c}$ $\boxed{a = -\frac{2}{7}x + \frac{4}{7}b - \frac{5}{7}c}$ $\boxed{c = -\frac{2}{5}x + \frac{4}{5}b - \frac{7}{5}a}$

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