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Simplifying -87 = 5x + 4(-7x + 7) Reorder the terms: -87 = 5x + 4(7 + -7x) -87 = 5x + (7 * 4 + -7x * 4) -87 = 5x + (28 + -28x) Reorder the terms: -87 = 28 + 5x + -28x Combine like terms: 5x + -28x = -23x -87 = 28 + -23x Solving -87 = 28 + -23x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '23x' to each side of the equation. -87 + 23x = 28 + -23x + 23x Combine like terms: -23x + 23x = 0 -87 + 23x = 28 + 0 -87 + 23x = 28 Add '87' to each side of the equation. -87 + 87 + 23x = 28 + 87 Combine like terms: -87 + 87 = 0 0 + 23x = 28 + 87 23x = 28 + 87 Combine like terms: 28 + 87 = 115 23x = 115 Divide each side by '23'. x = 5 Simplifying x = 5
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