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Simplifying 126 + -5a + 3(7 + -2a) = 180 126 + -5a + (7 * 3 + -2a * 3) = 180 126 + -5a + (21 + -6a) = 180 Reorder the terms: 126 + 21 + -5a + -6a = 180 Combine like terms: 126 + 21 = 147 147 + -5a + -6a = 180 Combine like terms: -5a + -6a = -11a 147 + -11a = 180 Solving 147 + -11a = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-147' to each side of the equation. 147 + -147 + -11a = 180 + -147 Combine like terms: 147 + -147 = 0 0 + -11a = 180 + -147 -11a = 180 + -147 Combine like terms: 180 + -147 = 33 -11a = 33 Divide each side by '-11'. a = -3 Simplifying a = -3
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