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Simplifying 87 = -6x + -3(-6x + 7) Reorder the terms: 87 = -6x + -3(7 + -6x) 87 = -6x + (7 * -3 + -6x * -3) 87 = -6x + (-21 + 18x) Reorder the terms: 87 = -21 + -6x + 18x Combine like terms: -6x + 18x = 12x 87 = -21 + 12x Solving 87 = -21 + 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 + -12x = -21 + 12x + -12x Combine like terms: 12x + -12x = 0 87 + -12x = -21 + 0 87 + -12x = -21 Add '-87' to each side of the equation. 87 + -87 + -12x = -21 + -87 Combine like terms: 87 + -87 = 0 0 + -12x = -21 + -87 -12x = -21 + -87 Combine like terms: -21 + -87 = -108 -12x = -108 Divide each side by '-12'. x = 9 Simplifying x = 9
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