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Simplifying -159 = -3(7x + -3) Reorder the terms: -159 = -3(-3 + 7x) -159 = (-3 * -3 + 7x * -3) -159 = (9 + -21x) Solving -159 = 9 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. -159 + 21x = 9 + -21x + 21x Combine like terms: -21x + 21x = 0 -159 + 21x = 9 + 0 -159 + 21x = 9 Add '159' to each side of the equation. -159 + 159 + 21x = 9 + 159 Combine like terms: -159 + 159 = 0 0 + 21x = 9 + 159 21x = 9 + 159 Combine like terms: 9 + 159 = 168 21x = 168 Divide each side by '21'. x = 8 Simplifying x = 8
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