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Simplifying 7a + -15 = 5a + 15 Reorder the terms: -15 + 7a = 5a + 15 Reorder the terms: -15 + 7a = 15 + 5a Solving -15 + 7a = 15 + 5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5a' to each side of the equation. -15 + 7a + -5a = 15 + 5a + -5a Combine like terms: 7a + -5a = 2a -15 + 2a = 15 + 5a + -5a Combine like terms: 5a + -5a = 0 -15 + 2a = 15 + 0 -15 + 2a = 15 Add '15' to each side of the equation. -15 + 15 + 2a = 15 + 15 Combine like terms: -15 + 15 = 0 0 + 2a = 15 + 15 2a = 15 + 15 Combine like terms: 15 + 15 = 30 2a = 30 Divide each side by '2'. a = 15 Simplifying a = 15
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