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Simplifying -2(-9 + -3x) = 90 (-9 * -2 + -3x * -2) = 90 (18 + 6x) = 90 Solving 18 + 6x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 6x = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 6x = 90 + -18 6x = 90 + -18 Combine like terms: 90 + -18 = 72 6x = 72 Divide each side by '6'. x = 12 Simplifying x = 12
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