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Simplifying 87 + -4x = 8x + 15 Reorder the terms: 87 + -4x = 15 + 8x Solving 87 + -4x = 15 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 87 + -4x + -8x = 15 + 8x + -8x Combine like terms: -4x + -8x = -12x 87 + -12x = 15 + 8x + -8x Combine like terms: 8x + -8x = 0 87 + -12x = 15 + 0 87 + -12x = 15 Add '-87' to each side of the equation. 87 + -87 + -12x = 15 + -87 Combine like terms: 87 + -87 = 0 0 + -12x = 15 + -87 -12x = 15 + -87 Combine like terms: 15 + -87 = -72 -12x = -72 Divide each side by '-12'. x = 6 Simplifying x = 6
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