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Simplifying (2x + -5) + (4x + -13) = 90 Reorder the terms: (-5 + 2x) + (4x + -13) = 90 Remove parenthesis around (-5 + 2x) -5 + 2x + (4x + -13) = 90 Reorder the terms: -5 + 2x + (-13 + 4x) = 90 Remove parenthesis around (-13 + 4x) -5 + 2x + -13 + 4x = 90 Reorder the terms: -5 + -13 + 2x + 4x = 90 Combine like terms: -5 + -13 = -18 -18 + 2x + 4x = 90 Combine like terms: 2x + 4x = 6x -18 + 6x = 90 Solving -18 + 6x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 6x = 90 + 18 Combine like terms: -18 + 18 = 0 0 + 6x = 90 + 18 6x = 90 + 18 Combine like terms: 90 + 18 = 108 6x = 108 Divide each side by '6'. x = 18 Simplifying x = 18
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