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Simplifying 189 = -7(3a + -3) Reorder the terms: 189 = -7(-3 + 3a) 189 = (-3 * -7 + 3a * -7) 189 = (21 + -21a) Solving 189 = 21 + -21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21a' to each side of the equation. 189 + 21a = 21 + -21a + 21a Combine like terms: -21a + 21a = 0 189 + 21a = 21 + 0 189 + 21a = 21 Add '-189' to each side of the equation. 189 + -189 + 21a = 21 + -189 Combine like terms: 189 + -189 = 0 0 + 21a = 21 + -189 21a = 21 + -189 Combine like terms: 21 + -189 = -168 21a = -168 Divide each side by '21'. a = -8 Simplifying a = -8
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