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Simplifying (6x + -1) + 7x = 90 Reorder the terms: (-1 + 6x) + 7x = 90 Remove parenthesis around (-1 + 6x) -1 + 6x + 7x = 90 Combine like terms: 6x + 7x = 13x -1 + 13x = 90 Solving -1 + 13x = 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 + 13x = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 13x = 90 + 1 13x = 90 + 1 Combine like terms: 90 + 1 = 91 13x = 91 Divide each side by '13'. x = 7 Simplifying x = 7
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