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Simplifying 2b + a + 12 = 90 Reorder the terms: 12 + a + 2b = 90 Solving 12 + a + 2b = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + a + -12 + 2b = 90 + -12 Reorder the terms: 12 + -12 + a + 2b = 90 + -12 Combine like terms: 12 + -12 = 0 0 + a + 2b = 90 + -12 a + 2b = 90 + -12 Combine like terms: 90 + -12 = 78 a + 2b = 78 Add '-2b' to each side of the equation. a + 2b + -2b = 78 + -2b Combine like terms: 2b + -2b = 0 a + 0 = 78 + -2b a = 78 + -2b Simplifying a = 78 + -2b
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