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Simplifying 189 = -7 + -7(-1 + 3x) 189 = -7 + (-1 * -7 + 3x * -7) 189 = -7 + (7 + -21x) Combine like terms: -7 + 7 = 0 189 = 0 + -21x 189 = -21x Solving 189 = -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 = -21x + 21x Combine like terms: -21x + 21x = 0 189 + 21x = 0 Add '-189' to each side of the equation. 189 + -189 + 21x = 0 + -189 Combine like terms: 189 + -189 = 0 0 + 21x = 0 + -189 21x = 0 + -189 Combine like terms: 0 + -189 = -189 21x = -189 Divide each side by '21'. x = -9 Simplifying x = -9
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