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Simplifying 90 = 5x + -1(2x + -30) Reorder the terms: 90 = 5x + -1(-30 + 2x) 90 = 5x + (-30 * -1 + 2x * -1) 90 = 5x + (30 + -2x) Reorder the terms: 90 = 30 + 5x + -2x Combine like terms: 5x + -2x = 3x 90 = 30 + 3x Solving 90 = 30 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 90 + -3x = 30 + 3x + -3x Combine like terms: 3x + -3x = 0 90 + -3x = 30 + 0 90 + -3x = 30 Add '-90' to each side of the equation. 90 + -90 + -3x = 30 + -90 Combine like terms: 90 + -90 = 0 0 + -3x = 30 + -90 -3x = 30 + -90 Combine like terms: 30 + -90 = -60 -3x = -60 Divide each side by '-3'. x = 20 Simplifying x = 20
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