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Simplifying 90 = 2x + -30 + x Reorder the terms: 90 = -30 + 2x + x Combine like terms: 2x + x = 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 = -120 -3x = -120 Divide each side by '-3'. x = 40 Simplifying x = 40
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