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Simplifying 7x + 5(-5x + -15) = 87 Reorder the terms: 7x + 5(-15 + -5x) = 87 7x + (-15 * 5 + -5x * 5) = 87 7x + (-75 + -25x) = 87 Reorder the terms: -75 + 7x + -25x = 87 Combine like terms: 7x + -25x = -18x -75 + -18x = 87 Solving -75 + -18x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '75' to each side of the equation. -75 + 75 + -18x = 87 + 75 Combine like terms: -75 + 75 = 0 0 + -18x = 87 + 75 -18x = 87 + 75 Combine like terms: 87 + 75 = 162 -18x = 162 Divide each side by '-18'. x = -9 Simplifying x = -9
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