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Simplifying 30 = -3(a + -7) Reorder the terms: 30 = -3(-7 + a) 30 = (-7 * -3 + a * -3) 30 = (21 + -3a) Solving 30 = 21 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. 30 + 3a = 21 + -3a + 3a Combine like terms: -3a + 3a = 0 30 + 3a = 21 + 0 30 + 3a = 21 Add '-30' to each side of the equation. 30 + -30 + 3a = 21 + -30 Combine like terms: 30 + -30 = 0 0 + 3a = 21 + -30 3a = 21 + -30 Combine like terms: 21 + -30 = -9 3a = -9 Divide each side by '3'. a = -3 Simplifying a = -3
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