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Simplifying 57 = 2a + (a + -3) + a Reorder the terms: 57 = 2a + (-3 + a) + a Remove parenthesis around (-3 + a) 57 = 2a + -3 + a + a Reorder the terms: 57 = -3 + 2a + a + a Combine like terms: 2a + a = 3a 57 = -3 + 3a + a Combine like terms: 3a + a = 4a 57 = -3 + 4a Solving 57 = -3 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 57 + -4a = -3 + 4a + -4a Combine like terms: 4a + -4a = 0 57 + -4a = -3 + 0 57 + -4a = -3 Add '-57' to each side of the equation. 57 + -57 + -4a = -3 + -57 Combine like terms: 57 + -57 = 0 0 + -4a = -3 + -57 -4a = -3 + -57 Combine like terms: -3 + -57 = -60 -4a = -60 Divide each side by '-4'. a = 15 Simplifying a = 15
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