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Simplifying 90 = (x + 10) + (2x + 40) Reorder the terms: 90 = (10 + x) + (2x + 40) Remove parenthesis around (10 + x) 90 = 10 + x + (2x + 40) Reorder the terms: 90 = 10 + x + (40 + 2x) Remove parenthesis around (40 + 2x) 90 = 10 + x + 40 + 2x Reorder the terms: 90 = 10 + 40 + x + 2x Combine like terms: 10 + 40 = 50 90 = 50 + x + 2x Combine like terms: x + 2x = 3x 90 = 50 + 3x Solving 90 = 50 + 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 = 50 + 3x + -3x Combine like terms: 3x + -3x = 0 90 + -3x = 50 + 0 90 + -3x = 50 Add '-90' to each side of the equation. 90 + -90 + -3x = 50 + -90 Combine like terms: 90 + -90 = 0 0 + -3x = 50 + -90 -3x = 50 + -90 Combine like terms: 50 + -90 = -40 -3x = -40 Divide each side by '-3'. x = 13.33333333 Simplifying x = 13.33333333
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