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Simplifying (7x + -4) + (3x + 4) = 90 Reorder the terms: (-4 + 7x) + (3x + 4) = 90 Remove parenthesis around (-4 + 7x) -4 + 7x + (3x + 4) = 90 Reorder the terms: -4 + 7x + (4 + 3x) = 90 Remove parenthesis around (4 + 3x) -4 + 7x + 4 + 3x = 90 Reorder the terms: -4 + 4 + 7x + 3x = 90 Combine like terms: -4 + 4 = 0 0 + 7x + 3x = 90 7x + 3x = 90 Combine like terms: 7x + 3x = 10x 10x = 90 Solving 10x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '10'. x = 9 Simplifying x = 9
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