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Simplifying 9 + -1a = 2a + 13 Reorder the terms: 9 + -1a = 13 + 2a Solving 9 + -1a = 13 + 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 = 13 + 2a + -2a Combine like terms: -1a + -2a = -3a 9 + -3a = 13 + 2a + -2a Combine like terms: 2a + -2a = 0 9 + -3a = 13 + 0 9 + -3a = 13 Add '-9' to each side of the equation. 9 + -9 + -3a = 13 + -9 Combine like terms: 9 + -9 = 0 0 + -3a = 13 + -9 -3a = 13 + -9 Combine like terms: 13 + -9 = 4 -3a = 4 Divide each side by '-3'. a = -1.333333333 Simplifying a = -1.333333333
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