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Simplifying a + 2b + (b + -15) = 109 Reorder the terms: a + 2b + (-15 + b) = 109 Remove parenthesis around (-15 + b) a + 2b + -15 + b = 109 Reorder the terms: -15 + a + 2b + b = 109 Combine like terms: 2b + b = 3b -15 + a + 3b = 109 Solving -15 + a + 3b = 109 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 + a + 15 + 3b = 109 + 15 Reorder the terms: -15 + 15 + a + 3b = 109 + 15 Combine like terms: -15 + 15 = 0 0 + a + 3b = 109 + 15 a + 3b = 109 + 15 Combine like terms: 109 + 15 = 124 a + 3b = 124 Add '-3b' to each side of the equation. a + 3b + -3b = 124 + -3b Combine like terms: 3b + -3b = 0 a + 0 = 124 + -3b a = 124 + -3b Simplifying a = 124 + -3b
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