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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 = 9 -3x = 9 Divide each side by '-3'. x = -3 Simplifying x = -3
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