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Simplifying 3a + b = a + -15 Reorder the terms: 3a + b = -15 + a Solving 3a + b = -15 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 3a + -1a + b = -15 + a + -1a Combine like terms: 3a + -1a = 2a 2a + b = -15 + a + -1a Combine like terms: a + -1a = 0 2a + b = -15 + 0 2a + b = -15 Add '-1b' to each side of the equation. 2a + b + -1b = -15 + -1b Combine like terms: b + -1b = 0 2a + 0 = -15 + -1b 2a = -15 + -1b Divide each side by '2'. a = -7.5 + -0.5b Simplifying a = -7.5 + -0.5b
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