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Simplifying (5x + -4) + (3x + 4) = 72 Reorder the terms: (-4 + 5x) + (3x + 4) = 72 Remove parenthesis around (-4 + 5x) -4 + 5x + (3x + 4) = 72 Reorder the terms: -4 + 5x + (4 + 3x) = 72 Remove parenthesis around (4 + 3x) -4 + 5x + 4 + 3x = 72 Reorder the terms: -4 + 4 + 5x + 3x = 72 Combine like terms: -4 + 4 = 0 0 + 5x + 3x = 72 5x + 3x = 72 Combine like terms: 5x + 3x = 8x 8x = 72 Solving 8x = 72 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '8'. x = 9 Simplifying x = 9
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