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Simplifying 4x + -7(x + 20) = 87 Reorder the terms: 4x + -7(20 + x) = 87 4x + (20 * -7 + x * -7) = 87 4x + (-140 + -7x) = 87 Reorder the terms: -140 + 4x + -7x = 87 Combine like terms: 4x + -7x = -3x -140 + -3x = 87 Solving -140 + -3x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '140' to each side of the equation. -140 + 140 + -3x = 87 + 140 Combine like terms: -140 + 140 = 0 0 + -3x = 87 + 140 -3x = 87 + 140 Combine like terms: 87 + 140 = 227 -3x = 227 Divide each side by '-3'. x = -75.66666667 Simplifying x = -75.66666667
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