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Simplifying 7x + -1(-1x) + x = 81 Remove parenthesis around (-1x) 7x + -1 * -1x + x = 81 Multiply -1 * -1 7x + 1x + x = 81 Combine like terms: 7x + 1x = 8x 8x + x = 81 Combine like terms: 8x + x = 9x 9x = 81 Solving 9x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '9'. x = 9 Simplifying x = 9
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