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Simplifying -3(7x + 4) = -159 Reorder the terms: -3(4 + 7x) = -159 (4 * -3 + 7x * -3) = -159 (-12 + -21x) = -159 Solving -12 + -21x = -159 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -21x = -159 + 12 Combine like terms: -12 + 12 = 0 0 + -21x = -159 + 12 -21x = -159 + 12 Combine like terms: -159 + 12 = -147 -21x = -147 Divide each side by '-21'. x = 7 Simplifying x = 7
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