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Simplifying 21a + 3 = 59 + 7a Reorder the terms: 3 + 21a = 59 + 7a Solving 3 + 21a = 59 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 3 + 21a + -7a = 59 + 7a + -7a Combine like terms: 21a + -7a = 14a 3 + 14a = 59 + 7a + -7a Combine like terms: 7a + -7a = 0 3 + 14a = 59 + 0 3 + 14a = 59 Add '-3' to each side of the equation. 3 + -3 + 14a = 59 + -3 Combine like terms: 3 + -3 = 0 0 + 14a = 59 + -3 14a = 59 + -3 Combine like terms: 59 + -3 = 56 14a = 56 Divide each side by '14'. a = 4 Simplifying a = 4
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