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Simplifying 15 + a + a = 7a Combine like terms: a + a = 2a 15 + 2a = 7a Solving 15 + 2a = 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 15 + 2a + -7a = 7a + -7a Combine like terms: 2a + -7a = -5a 15 + -5a = 7a + -7a Combine like terms: 7a + -7a = 0 15 + -5a = 0 Add '-15' to each side of the equation. 15 + -15 + -5a = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -5a = 0 + -15 -5a = 0 + -15 Combine like terms: 0 + -15 = -15 -5a = -15 Divide each side by '-5'. a = 3 Simplifying a = 3
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