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Simplifying (x + -4) + (2x + 5) = 91 Reorder the terms: (-4 + x) + (2x + 5) = 91 Remove parenthesis around (-4 + x) -4 + x + (2x + 5) = 91 Reorder the terms: -4 + x + (5 + 2x) = 91 Remove parenthesis around (5 + 2x) -4 + x + 5 + 2x = 91 Reorder the terms: -4 + 5 + x + 2x = 91 Combine like terms: -4 + 5 = 1 1 + x + 2x = 91 Combine like terms: x + 2x = 3x 1 + 3x = 91 Solving 1 + 3x = 91 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 3x = 91 + -1 Combine like terms: 1 + -1 = 0 0 + 3x = 91 + -1 3x = 91 + -1 Combine like terms: 91 + -1 = 90 3x = 90 Divide each side by '3'. x = 30 Simplifying x = 30
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