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Simplifying a + (a + 7) + (4a) = 157 Reorder the terms: a + (7 + a) + (4a) = 157 Remove parenthesis around (7 + a) a + 7 + a + (4a) = 157 Reorder the terms: 7 + a + a + (4a) = 157 Combine like terms: a + a = 2a 7 + 2a + (4a) = 157 Combine like terms: 2a + (4a) = 6a 7 + 6a = 157 Solving 7 + 6a = 157 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 + 6a = 157 + -7 Combine like terms: 7 + -7 = 0 0 + 6a = 157 + -7 6a = 157 + -7 Combine like terms: 157 + -7 = 150 6a = 150 Divide each side by '6'. a = 25 Simplifying a = 25
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