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Simplifying a + (3a + 7) = 215 Reorder the terms: a + (7 + 3a) = 215 Remove parenthesis around (7 + 3a) a + 7 + 3a = 215 Reorder the terms: 7 + a + 3a = 215 Combine like terms: a + 3a = 4a 7 + 4a = 215 Solving 7 + 4a = 215 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 4a = 215 + -7 Combine like terms: 7 + -7 = 0 0 + 4a = 215 + -7 4a = 215 + -7 Combine like terms: 215 + -7 = 208 4a = 208 Divide each side by '4'. a = 52 Simplifying a = 52
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