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Simplifying 9 = -7 + -3a + a Combine like terms: -3a + a = -2a 9 = -7 + -2a Solving 9 = -7 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 9 + 2a = -7 + -2a + 2a Combine like terms: -2a + 2a = 0 9 + 2a = -7 + 0 9 + 2a = -7 Add '-9' to each side of the equation. 9 + -9 + 2a = -7 + -9 Combine like terms: 9 + -9 = 0 0 + 2a = -7 + -9 2a = -7 + -9 Combine like terms: -7 + -9 = -16 2a = -16 Divide each side by '2'. a = -8 Simplifying a = -8
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