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Simplifying 7 + -1(3x + -2) = 21 Reorder the terms: 7 + -1(-2 + 3x) = 21 7 + (-2 * -1 + 3x * -1) = 21 7 + (2 + -3x) = 21 Combine like terms: 7 + 2 = 9 9 + -3x = 21 Solving 9 + -3x = 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 + -3x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -3x = 21 + -9 -3x = 21 + -9 Combine like terms: 21 + -9 = 12 -3x = 12 Divide each side by '-3'. x = -4 Simplifying x = -4
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