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Simplifying 21 = -4(3x + -1) + -18 Reorder the terms: 21 = -4(-1 + 3x) + -18 21 = (-1 * -4 + 3x * -4) + -18 21 = (4 + -12x) + -18 Reorder the terms: 21 = 4 + -18 + -12x Combine like terms: 4 + -18 = -14 21 = -14 + -12x Solving 21 = -14 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. 21 + 12x = -14 + -12x + 12x Combine like terms: -12x + 12x = 0 21 + 12x = -14 + 0 21 + 12x = -14 Add '-21' to each side of the equation. 21 + -21 + 12x = -14 + -21 Combine like terms: 21 + -21 = 0 0 + 12x = -14 + -21 12x = -14 + -21 Combine like terms: -14 + -21 = -35 12x = -35 Divide each side by '12'. x = -2.916666667 Simplifying x = -2.916666667
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