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Simplifying 15 = -7a + -8a Combine like terms: -7a + -8a = -15a 15 = -15a Solving 15 = -15a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15a' to each side of the equation. 15 + 15a = -15a + 15a Combine like terms: -15a + 15a = 0 15 + 15a = 0 Add '-15' to each side of the equation. 15 + -15 + 15a = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 15a = 0 + -15 15a = 0 + -15 Combine like terms: 0 + -15 = -15 15a = -15 Divide each side by '15'. a = -1 Simplifying a = -1
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