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Simplifying 15 = -7a + 5a Combine like terms: -7a + 5a = -2a 15 = -2a Solving 15 = -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. 15 + 2a = -2a + 2a Combine like terms: -2a + 2a = 0 15 + 2a = 0 Add '-15' to each side of the equation. 15 + -15 + 2a = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 2a = 0 + -15 2a = 0 + -15 Combine like terms: 0 + -15 = -15 2a = -15 Divide each side by '2'. a = -7.5 Simplifying a = -7.5
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