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Simplifying (6x) + 7(x + -1) = 690 Reorder the terms: (6x) + 7(-1 + x) = 690 (6x) + (-1 * 7 + x * 7) = 690 (6x) + (-7 + 7x) = 690 Reorder the terms: -7 + (6x) + 7x = 690 Combine like terms: (6x) + 7x = 13x -7 + 13x = 690 Solving -7 + 13x = 690 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 13x = 690 + 7 Combine like terms: -7 + 7 = 0 0 + 13x = 690 + 7 13x = 690 + 7 Combine like terms: 690 + 7 = 697 13x = 697 Divide each side by '13'. x = 53.61538462 Simplifying x = 53.61538462
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