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Simplifying 7a + -9 = 4a + 15 Reorder the terms: -9 + 7a = 4a + 15 Reorder the terms: -9 + 7a = 15 + 4a Solving -9 + 7a = 15 + 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. -9 + 7a + -4a = 15 + 4a + -4a Combine like terms: 7a + -4a = 3a -9 + 3a = 15 + 4a + -4a Combine like terms: 4a + -4a = 0 -9 + 3a = 15 + 0 -9 + 3a = 15 Add '9' to each side of the equation. -9 + 9 + 3a = 15 + 9 Combine like terms: -9 + 9 = 0 0 + 3a = 15 + 9 3a = 15 + 9 Combine like terms: 15 + 9 = 24 3a = 24 Divide each side by '3'. a = 8 Simplifying a = 8
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