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Simplifying 138 = -3(3 + 7a) 138 = (3 * -3 + 7a * -3) 138 = (-9 + -21a) Solving 138 = -9 + -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. 138 + 21a = -9 + -21a + 21a Combine like terms: -21a + 21a = 0 138 + 21a = -9 + 0 138 + 21a = -9 Add '-138' to each side of the equation. 138 + -138 + 21a = -9 + -138 Combine like terms: 138 + -138 = 0 0 + 21a = -9 + -138 21a = -9 + -138 Combine like terms: -9 + -138 = -147 21a = -147 Divide each side by '21'. a = -7 Simplifying a = -7
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