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Simplifying 2 + -1(x + -7) = 21 Reorder the terms: 2 + -1(-7 + x) = 21 2 + (-7 * -1 + x * -1) = 21 2 + (7 + -1x) = 21 Combine like terms: 2 + 7 = 9 9 + -1x = 21 Solving 9 + -1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 21 + -9 -1x = 21 + -9 Combine like terms: 21 + -9 = 12 -1x = 12 Divide each side by '-1'. x = -12 Simplifying x = -12
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