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Simplifying 90 = x + (x + 15) Reorder the terms: 90 = x + (15 + x) Remove parenthesis around (15 + x) 90 = x + 15 + x Reorder the terms: 90 = 15 + x + x Combine like terms: x + x = 2x 90 = 15 + 2x Solving 90 = 15 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 90 + -2x = 15 + 2x + -2x Combine like terms: 2x + -2x = 0 90 + -2x = 15 + 0 90 + -2x = 15 Add '-90' to each side of the equation. 90 + -90 + -2x = 15 + -90 Combine like terms: 90 + -90 = 0 0 + -2x = 15 + -90 -2x = 15 + -90 Combine like terms: 15 + -90 = -75 -2x = -75 Divide each side by '-2'. x = 37.5 Simplifying x = 37.5
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