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Simplifying -87 = 3(-5 + -3x) -87 = (-5 * 3 + -3x * 3) -87 = (-15 + -9x) Solving -87 = -15 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -87 + 9x = -15 + -9x + 9x Combine like terms: -9x + 9x = 0 -87 + 9x = -15 + 0 -87 + 9x = -15 Add '87' to each side of the equation. -87 + 87 + 9x = -15 + 87 Combine like terms: -87 + 87 = 0 0 + 9x = -15 + 87 9x = -15 + 87 Combine like terms: -15 + 87 = 72 9x = 72 Divide each side by '9'. x = 8 Simplifying x = 8
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