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Simplifying -21 = -3(x + -4) Reorder the terms: -21 = -3(-4 + x) -21 = (-4 * -3 + x * -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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