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Simplifying (2a + b) + (a + 2b) = 90 Remove parenthesis around (2a + b) 2a + b + (a + 2b) = 90 Remove parenthesis around (a + 2b) 2a + b + a + 2b = 90 Reorder the terms: 2a + a + b + 2b = 90 Combine like terms: 2a + a = 3a 3a + b + 2b = 90 Combine like terms: b + 2b = 3b 3a + 3b = 90 Solving 3a + 3b = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3b' to each side of the equation. 3a + 3b + -3b = 90 + -3b Combine like terms: 3b + -3b = 0 3a + 0 = 90 + -3b 3a = 90 + -3b Divide each side by '3'. a = 30 + -1b Simplifying a = 30 + -1b
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