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Simplifying 7x + -5(5x + 4) = 142 Reorder the terms: 7x + -5(4 + 5x) = 142 7x + (4 * -5 + 5x * -5) = 142 7x + (-20 + -25x) = 142 Reorder the terms: -20 + 7x + -25x = 142 Combine like terms: 7x + -25x = -18x -20 + -18x = 142 Solving -20 + -18x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -18x = 142 + 20 Combine like terms: -20 + 20 = 0 0 + -18x = 142 + 20 -18x = 142 + 20 Combine like terms: 142 + 20 = 162 -18x = 162 Divide each side by '-18'. x = -9 Simplifying x = -9
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