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Simplifying a + -2 = 13 + -2a Reorder the terms: -2 + a = 13 + -2a Solving -2 + a = 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. -2 + a + 2a = 13 + -2a + 2a Combine like terms: a + 2a = 3a -2 + 3a = 13 + -2a + 2a Combine like terms: -2a + 2a = 0 -2 + 3a = 13 + 0 -2 + 3a = 13 Add '2' to each side of the equation. -2 + 2 + 3a = 13 + 2 Combine like terms: -2 + 2 = 0 0 + 3a = 13 + 2 3a = 13 + 2 Combine like terms: 13 + 2 = 15 3a = 15 Divide each side by '3'. a = 5 Simplifying a = 5
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