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Simplifying (3a + -5) + a = 215 Reorder the terms: (-5 + 3a) + a = 215 Remove parenthesis around (-5 + 3a) -5 + 3a + a = 215 Combine like terms: 3a + a = 4a -5 + 4a = 215 Solving -5 + 4a = 215 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 4a = 215 + 5 Combine like terms: -5 + 5 = 0 0 + 4a = 215 + 5 4a = 215 + 5 Combine like terms: 215 + 5 = 220 4a = 220 Divide each side by '4'. a = 55 Simplifying a = 55
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