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Simplifying (7x + -1) + (3x + -9) = 90 Reorder the terms: (-1 + 7x) + (3x + -9) = 90 Remove parenthesis around (-1 + 7x) -1 + 7x + (3x + -9) = 90 Reorder the terms: -1 + 7x + (-9 + 3x) = 90 Remove parenthesis around (-9 + 3x) -1 + 7x + -9 + 3x = 90 Reorder the terms: -1 + -9 + 7x + 3x = 90 Combine like terms: -1 + -9 = -10 -10 + 7x + 3x = 90 Combine like terms: 7x + 3x = 10x -10 + 10x = 90 Solving -10 + 10x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 10x = 90 + 10 Combine like terms: -10 + 10 = 0 0 + 10x = 90 + 10 10x = 90 + 10 Combine like terms: 90 + 10 = 100 10x = 100 Divide each side by '10'. x = 10 Simplifying x = 10
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