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Simplifying 9 + -1a = 15 + -2a Solving 9 + -1a = 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 + -1a + 2a = 15 + -2a + 2a Combine like terms: -1a + 2a = 1a 9 + 1a = 15 + -2a + 2a Combine like terms: -2a + 2a = 0 9 + 1a = 15 + 0 9 + 1a = 15 Add '-9' to each side of the equation. 9 + -9 + 1a = 15 + -9 Combine like terms: 9 + -9 = 0 0 + 1a = 15 + -9 1a = 15 + -9 Combine like terms: 15 + -9 = 6 1a = 6 Divide each side by '1'. a = 6 Simplifying a = 6
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