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Simplifying 4a + 90 + (a + b) = 180 Remove parenthesis around (a + b) 4a + 90 + a + b = 180 Reorder the terms: 90 + 4a + a + b = 180 Combine like terms: 4a + a = 5a 90 + 5a + b = 180 Solving 90 + 5a + b = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + 5a + -90 + b = 180 + -90 Reorder the terms: 90 + -90 + 5a + b = 180 + -90 Combine like terms: 90 + -90 = 0 0 + 5a + b = 180 + -90 5a + b = 180 + -90 Combine like terms: 180 + -90 = 90 5a + b = 90 Add '-1b' to each side of the equation. 5a + b + -1b = 90 + -1b Combine like terms: b + -1b = 0 5a + 0 = 90 + -1b 5a = 90 + -1b Divide each side by '5'. a = 18 + -0.2b Simplifying a = 18 + -0.2b
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