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Simplifying 90 + -1(7x + -1) = 180 Reorder the terms: 90 + -1(-1 + 7x) = 180 90 + (-1 * -1 + 7x * -1) = 180 90 + (1 + -7x) = 180 Combine like terms: 90 + 1 = 91 91 + -7x = 180 Solving 91 + -7x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-91' to each side of the equation. 91 + -91 + -7x = 180 + -91 Combine like terms: 91 + -91 = 0 0 + -7x = 180 + -91 -7x = 180 + -91 Combine like terms: 180 + -91 = 89 -7x = 89 Divide each side by '-7'. x = -12.71428571 Simplifying x = -12.71428571
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