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Simplifying 15 + -1a = 2(a + 3) Reorder the terms: 15 + -1a = 2(3 + a) 15 + -1a = (3 * 2 + a * 2) 15 + -1a = (6 + 2a) Solving 15 + -1a = 6 + 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 = 6 + 2a + -2a Combine like terms: -1a + -2a = -3a 15 + -3a = 6 + 2a + -2a Combine like terms: 2a + -2a = 0 15 + -3a = 6 + 0 15 + -3a = 6 Add '-15' to each side of the equation. 15 + -15 + -3a = 6 + -15 Combine like terms: 15 + -15 = 0 0 + -3a = 6 + -15 -3a = 6 + -15 Combine like terms: 6 + -15 = -9 -3a = -9 Divide each side by '-3'. a = 3 Simplifying a = 3
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