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Simplifying 3a + 7 = a + 15 Reorder the terms: 7 + 3a = a + 15 Reorder the terms: 7 + 3a = 15 + a Solving 7 + 3a = 15 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 7 + 3a + -1a = 15 + a + -1a Combine like terms: 3a + -1a = 2a 7 + 2a = 15 + a + -1a Combine like terms: a + -1a = 0 7 + 2a = 15 + 0 7 + 2a = 15 Add '-7' to each side of the equation. 7 + -7 + 2a = 15 + -7 Combine like terms: 7 + -7 = 0 0 + 2a = 15 + -7 2a = 15 + -7 Combine like terms: 15 + -7 = 8 2a = 8 Divide each side by '2'. a = 4 Simplifying a = 4
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