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Simplifying 189 = -3(-7x + -7) Reorder the terms: 189 = -3(-7 + -7x) 189 = (-7 * -3 + -7x * -3) 189 = (21 + 21x) Solving 189 = 21 + 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. 189 + -21x = 21 + 21x + -21x Combine like terms: 21x + -21x = 0 189 + -21x = 21 + 0 189 + -21x = 21 Add '-189' to each side of the equation. 189 + -189 + -21x = 21 + -189 Combine like terms: 189 + -189 = 0 0 + -21x = 21 + -189 -21x = 21 + -189 Combine like terms: 21 + -189 = -168 -21x = -168 Divide each side by '-21'. x = 8 Simplifying x = 8
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