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Simplifying -21 = 3(4x + -3) Reorder the terms: -21 = 3(-3 + 4x) -21 = (-3 * 3 + 4x * 3) -21 = (-9 + 12x) Solving -21 = -9 + 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 = -9 + 12x + -12x Combine like terms: 12x + -12x = 0 -21 + -12x = -9 + 0 -21 + -12x = -9 Add '21' to each side of the equation. -21 + 21 + -12x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + -12x = -9 + 21 -12x = -9 + 21 Combine like terms: -9 + 21 = 12 -12x = 12 Divide each side by '-12'. x = -1 Simplifying x = -1
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