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Simplifying -3(x + -4) = -21 Reorder the terms: -3(-4 + x) = -21 (-4 * -3 + x * -3) = -21 (12 + -3x) = -21 Solving 12 + -3x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -3x = -21 + -12 Combine like terms: 12 + -12 = 0 0 + -3x = -21 + -12 -3x = -21 + -12 Combine like terms: -21 + -12 = -33 -3x = -33 Divide each side by '-3'. x = 11 Simplifying x = 11
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