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Simplifying (5x + -1) + (2x) = 90 Reorder the terms: (-1 + 5x) + (2x) = 90 Remove parenthesis around (-1 + 5x) -1 + 5x + (2x) = 90 Combine like terms: 5x + (2x) = 7x -1 + 7x = 90 Solving -1 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 7x = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 7x = 90 + 1 7x = 90 + 1 Combine like terms: 90 + 1 = 91 7x = 91 Divide each side by '7'. x = 13 Simplifying x = 13
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