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Simplifying 7a + 13 = 57 + -4a Reorder the terms: 13 + 7a = 57 + -4a Solving 13 + 7a = 57 + -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. 13 + 7a + 4a = 57 + -4a + 4a Combine like terms: 7a + 4a = 11a 13 + 11a = 57 + -4a + 4a Combine like terms: -4a + 4a = 0 13 + 11a = 57 + 0 13 + 11a = 57 Add '-13' to each side of the equation. 13 + -13 + 11a = 57 + -13 Combine like terms: 13 + -13 = 0 0 + 11a = 57 + -13 11a = 57 + -13 Combine like terms: 57 + -13 = 44 11a = 44 Divide each side by '11'. a = 4 Simplifying a = 4
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