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Simplifying x + 87 = -4x + 7 Reorder the terms: 87 + x = -4x + 7 Reorder the terms: 87 + x = 7 + -4x Solving 87 + x = 7 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 87 + x + 4x = 7 + -4x + 4x Combine like terms: x + 4x = 5x 87 + 5x = 7 + -4x + 4x Combine like terms: -4x + 4x = 0 87 + 5x = 7 + 0 87 + 5x = 7 Add '-87' to each side of the equation. 87 + -87 + 5x = 7 + -87 Combine like terms: 87 + -87 = 0 0 + 5x = 7 + -87 5x = 7 + -87 Combine like terms: 7 + -87 = -80 5x = -80 Divide each side by '5'. x = -16 Simplifying x = -16
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