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Simplifying 18 + -1(7x) = 80 Remove parenthesis around (7x) 18 + -1 * 7x = 80 Multiply -1 * 7 18 + -7x = 80 Solving 18 + -7x = 80 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -7x = 80 + -18 Combine like terms: 18 + -18 = 0 0 + -7x = 80 + -18 -7x = 80 + -18 Combine like terms: 80 + -18 = 62 -7x = 62 Divide each side by '-7'. x = -8.857142857 Simplifying x = -8.857142857
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