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Simplifying 90 = (28 + x) + x Remove parenthesis around (28 + x) 90 = 28 + x + x Combine like terms: x + x = 2x 90 = 28 + 2x Solving 90 = 28 + 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 = 28 + 2x + -2x Combine like terms: 2x + -2x = 0 90 + -2x = 28 + 0 90 + -2x = 28 Add '-90' to each side of the equation. 90 + -90 + -2x = 28 + -90 Combine like terms: 90 + -90 = 0 0 + -2x = 28 + -90 -2x = 28 + -90 Combine like terms: 28 + -90 = -62 -2x = -62 Divide each side by '-2'. x = 31 Simplifying x = 31
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