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Simplifying 12x + -1(-90) = -18 Multiply -1 * -90 12x + 90 = -18 Reorder the terms: 90 + 12x = -18 Solving 90 + 12x = -18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 12x = -18 + -90 Combine like terms: 90 + -90 = 0 0 + 12x = -18 + -90 12x = -18 + -90 Combine like terms: -18 + -90 = -108 12x = -108 Divide each side by '12'. x = -9 Simplifying x = -9
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