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Simplifying 15 + -1a + 3a = 7 Combine like terms: -1a + 3a = 2a 15 + 2a = 7 Solving 15 + 2a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 2a = 7 + -15 Combine like terms: 15 + -15 = 0 0 + 2a = 7 + -15 2a = 7 + -15 Combine like terms: 7 + -15 = -8 2a = -8 Divide each side by '2'. a = -4 Simplifying a = -4
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