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Simplifying -5x + 2(-1x + 9) = -31 Reorder the terms: -5x + 2(9 + -1x) = -31 -5x + (9 * 2 + -1x * 2) = -31 -5x + (18 + -2x) = -31 Reorder the terms: 18 + -5x + -2x = -31 Combine like terms: -5x + -2x = -7x 18 + -7x = -31 Solving 18 + -7x = -31 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 = -31 + -18 Combine like terms: 18 + -18 = 0 0 + -7x = -31 + -18 -7x = -31 + -18 Combine like terms: -31 + -18 = -49 -7x = -49 Divide each side by '-7'. x = 7 Simplifying x = 7
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