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Simplifying (3x + -1) + (7x + 1) = 90 Reorder the terms: (-1 + 3x) + (7x + 1) = 90 Remove parenthesis around (-1 + 3x) -1 + 3x + (7x + 1) = 90 Reorder the terms: -1 + 3x + (1 + 7x) = 90 Remove parenthesis around (1 + 7x) -1 + 3x + 1 + 7x = 90 Reorder the terms: -1 + 1 + 3x + 7x = 90 Combine like terms: -1 + 1 = 0 0 + 3x + 7x = 90 3x + 7x = 90 Combine like terms: 3x + 7x = 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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