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Simplifying 90 = x + -15 + 2x Reorder the terms: 90 = -15 + x + 2x Combine like terms: x + 2x = 3x 90 = -15 + 3x Solving 90 = -15 + 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 = -15 + 3x + -3x Combine like terms: 3x + -3x = 0 90 + -3x = -15 + 0 90 + -3x = -15 Add '-90' to each side of the equation. 90 + -90 + -3x = -15 + -90 Combine like terms: 90 + -90 = 0 0 + -3x = -15 + -90 -3x = -15 + -90 Combine like terms: -15 + -90 = -105 -3x = -105 Divide each side by '-3'. x = 35 Simplifying x = 35
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