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Simplifying 21 = -3(4 + -1x) 21 = (4 * -3 + -1x * -3) 21 = (-12 + 3x) Solving 21 = -12 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 21 + -3x = -12 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -3x = -12 + 0 21 + -3x = -12 Add '-21' to each side of the equation. 21 + -21 + -3x = -12 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = -12 + -21 -3x = -12 + -21 Combine like terms: -12 + -21 = -33 -3x = -33 Divide each side by '-3'. x = 11 Simplifying x = 11
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