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Simplifying (2x + -20) + (5x + -13) = 90 Reorder the terms: (-20 + 2x) + (5x + -13) = 90 Remove parenthesis around (-20 + 2x) -20 + 2x + (5x + -13) = 90 Reorder the terms: -20 + 2x + (-13 + 5x) = 90 Remove parenthesis around (-13 + 5x) -20 + 2x + -13 + 5x = 90 Reorder the terms: -20 + -13 + 2x + 5x = 90 Combine like terms: -20 + -13 = -33 -33 + 2x + 5x = 90 Combine like terms: 2x + 5x = 7x -33 + 7x = 90 Solving -33 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '33' to each side of the equation. -33 + 33 + 7x = 90 + 33 Combine like terms: -33 + 33 = 0 0 + 7x = 90 + 33 7x = 90 + 33 Combine like terms: 90 + 33 = 123 7x = 123 Divide each side by '7'. x = 17.57142857 Simplifying x = 17.57142857
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