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Simplifying b + -20 + 2a + a = 180 Reorder the terms: -20 + 2a + a + b = 180 Combine like terms: 2a + a = 3a -20 + 3a + b = 180 Solving -20 + 3a + b = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 3a + 20 + b = 180 + 20 Reorder the terms: -20 + 20 + 3a + b = 180 + 20 Combine like terms: -20 + 20 = 0 0 + 3a + b = 180 + 20 3a + b = 180 + 20 Combine like terms: 180 + 20 = 200 3a + b = 200 Add '-1b' to each side of the equation. 3a + b + -1b = 200 + -1b Combine like terms: b + -1b = 0 3a + 0 = 200 + -1b 3a = 200 + -1b Divide each side by '3'. a = 66.66666667 + -0.3333333333b Simplifying a = 66.66666667 + -0.3333333333b
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