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Simplifying -18x + 90 = -20(1 + 2x) Reorder the terms: 90 + -18x = -20(1 + 2x) 90 + -18x = (1 * -20 + 2x * -20) 90 + -18x = (-20 + -40x) Solving 90 + -18x = -20 + -40x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40x' to each side of the equation. 90 + -18x + 40x = -20 + -40x + 40x Combine like terms: -18x + 40x = 22x 90 + 22x = -20 + -40x + 40x Combine like terms: -40x + 40x = 0 90 + 22x = -20 + 0 90 + 22x = -20 Add '-90' to each side of the equation. 90 + -90 + 22x = -20 + -90 Combine like terms: 90 + -90 = 0 0 + 22x = -20 + -90 22x = -20 + -90 Combine like terms: -20 + -90 = -110 22x = -110 Divide each side by '22'. x = -5 Simplifying x = -5
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