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Simplifying 180 + -2a + b = 180 Add '-180' to each side of the equation. 180 + -2a + -180 + b = 180 + -180 Reorder the terms: 180 + -180 + -2a + b = 180 + -180 Combine like terms: 180 + -180 = 0 0 + -2a + b = 180 + -180 -2a + b = 180 + -180 Combine like terms: 180 + -180 = 0 -2a + b = 0 Solving -2a + b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1b' to each side of the equation. -2a + b + -1b = 0 + -1b Combine like terms: b + -1b = 0 -2a + 0 = 0 + -1b -2a = 0 + -1b Remove the zero: -2a = -1b Divide each side by '-2'. a = 0.5b Simplifying a = 0.5b
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