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Simplifying (x + -10) + (2x + 40) = 90 Reorder the terms: (-10 + x) + (2x + 40) = 90 Remove parenthesis around (-10 + x) -10 + x + (2x + 40) = 90 Reorder the terms: -10 + x + (40 + 2x) = 90 Remove parenthesis around (40 + 2x) -10 + x + 40 + 2x = 90 Reorder the terms: -10 + 40 + x + 2x = 90 Combine like terms: -10 + 40 = 30 30 + x + 2x = 90 Combine like terms: x + 2x = 3x 30 + 3x = 90 Solving 30 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 3x = 90 + -30 Combine like terms: 30 + -30 = 0 0 + 3x = 90 + -30 3x = 90 + -30 Combine like terms: 90 + -30 = 60 3x = 60 Divide each side by '3'. x = 20 Simplifying x = 20
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