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Simplifying -1a + 15 = 2a Reorder the terms: 15 + -1a = 2a Solving 15 + -1a = 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. 15 + -1a + -2a = 2a + -2a Combine like terms: -1a + -2a = -3a 15 + -3a = 2a + -2a Combine like terms: 2a + -2a = 0 15 + -3a = 0 Add '-15' to each side of the equation. 15 + -15 + -3a = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -3a = 0 + -15 -3a = 0 + -15 Combine like terms: 0 + -15 = -15 -3a = -15 Divide each side by '-3'. a = 5 Simplifying a = 5
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