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Simplifying (2x + -10) + (2x + -20) = 90 Reorder the terms: (-10 + 2x) + (2x + -20) = 90 Remove parenthesis around (-10 + 2x) -10 + 2x + (2x + -20) = 90 Reorder the terms: -10 + 2x + (-20 + 2x) = 90 Remove parenthesis around (-20 + 2x) -10 + 2x + -20 + 2x = 90 Reorder the terms: -10 + -20 + 2x + 2x = 90 Combine like terms: -10 + -20 = -30 -30 + 2x + 2x = 90 Combine like terms: 2x + 2x = 4x -30 + 4x = 90 Solving -30 + 4x = 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 + 4x = 90 + 30 Combine like terms: -30 + 30 = 0 0 + 4x = 90 + 30 4x = 90 + 30 Combine like terms: 90 + 30 = 120 4x = 120 Divide each side by '4'. x = 30 Simplifying x = 30
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