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Simplifying 90 = 5x + -2(2x + -30) Reorder the terms: 90 = 5x + -2(-30 + 2x) 90 = 5x + (-30 * -2 + 2x * -2) 90 = 5x + (60 + -4x) Reorder the terms: 90 = 60 + 5x + -4x Combine like terms: 5x + -4x = 1x 90 = 60 + 1x Solving 90 = 60 + 1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 90 + -1x = 60 + 1x + -1x Combine like terms: 1x + -1x = 0 90 + -1x = 60 + 0 90 + -1x = 60 Add '-90' to each side of the equation. 90 + -90 + -1x = 60 + -90 Combine like terms: 90 + -90 = 0 0 + -1x = 60 + -90 -1x = 60 + -90 Combine like terms: 60 + -90 = -30 -1x = -30 Divide each side by '-1'. x = 30 Simplifying x = 30
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