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Simplifying 2a + -9 = -2a + 15 Reorder the terms: -9 + 2a = -2a + 15 Reorder the terms: -9 + 2a = 15 + -2a Solving -9 + 2a = 15 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. -9 + 2a + 2a = 15 + -2a + 2a Combine like terms: 2a + 2a = 4a -9 + 4a = 15 + -2a + 2a Combine like terms: -2a + 2a = 0 -9 + 4a = 15 + 0 -9 + 4a = 15 Add '9' to each side of the equation. -9 + 9 + 4a = 15 + 9 Combine like terms: -9 + 9 = 0 0 + 4a = 15 + 9 4a = 15 + 9 Combine like terms: 15 + 9 = 24 4a = 24 Divide each side by '4'. a = 6 Simplifying a = 6
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