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Simplifying (21 + -2a) + (126 + -5a) = 180 Remove parenthesis around (21 + -2a) 21 + -2a + (126 + -5a) = 180 Remove parenthesis around (126 + -5a) 21 + -2a + 126 + -5a = 180 Reorder the terms: 21 + 126 + -2a + -5a = 180 Combine like terms: 21 + 126 = 147 147 + -2a + -5a = 180 Combine like terms: -2a + -5a = -7a 147 + -7a = 180 Solving 147 + -7a = 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 + -7a = 180 + -147 Combine like terms: 147 + -147 = 0 0 + -7a = 180 + -147 -7a = 180 + -147 Combine like terms: 180 + -147 = 33 -7a = 33 Divide each side by '-7'. a = -4.714285714 Simplifying a = -4.714285714
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