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Simplifying 12x + -3x + 87 = 12x + 39 Reorder the terms: 87 + 12x + -3x = 12x + 39 Combine like terms: 12x + -3x = 9x 87 + 9x = 12x + 39 Reorder the terms: 87 + 9x = 39 + 12x Solving 87 + 9x = 39 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 87 + 9x + -12x = 39 + 12x + -12x Combine like terms: 9x + -12x = -3x 87 + -3x = 39 + 12x + -12x Combine like terms: 12x + -12x = 0 87 + -3x = 39 + 0 87 + -3x = 39 Add '-87' to each side of the equation. 87 + -87 + -3x = 39 + -87 Combine like terms: 87 + -87 = 0 0 + -3x = 39 + -87 -3x = 39 + -87 Combine like terms: 39 + -87 = -48 -3x = -48 Divide each side by '-3'. x = 16 Simplifying x = 16
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