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Simplifying (7x + 8) + (9x + -8) = 128 Reorder the terms: (8 + 7x) + (9x + -8) = 128 Remove parenthesis around (8 + 7x) 8 + 7x + (9x + -8) = 128 Reorder the terms: 8 + 7x + (-8 + 9x) = 128 Remove parenthesis around (-8 + 9x) 8 + 7x + -8 + 9x = 128 Reorder the terms: 8 + -8 + 7x + 9x = 128 Combine like terms: 8 + -8 = 0 0 + 7x + 9x = 128 7x + 9x = 128 Combine like terms: 7x + 9x = 16x 16x = 128 Solving 16x = 128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '16'. x = 8 Simplifying x = 8
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