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Simplifying 90 + -1x = -12 + 2(90 + -1x) 90 + -1x = -12 + (90 * 2 + -1x * 2) 90 + -1x = -12 + (180 + -2x) Combine like terms: -12 + 180 = 168 90 + -1x = 168 + -2x Solving 90 + -1x = 168 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 90 + -1x + 2x = 168 + -2x + 2x Combine like terms: -1x + 2x = 1x 90 + 1x = 168 + -2x + 2x Combine like terms: -2x + 2x = 0 90 + 1x = 168 + 0 90 + 1x = 168 Add '-90' to each side of the equation. 90 + -90 + 1x = 168 + -90 Combine like terms: 90 + -90 = 0 0 + 1x = 168 + -90 1x = 168 + -90 Combine like terms: 168 + -90 = 78 1x = 78 Divide each side by '1'. x = 78 Simplifying x = 78
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