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Simplifying 4(3 + -1a) + -5 + 2a = 13 (3 * 4 + -1a * 4) + -5 + 2a = 13 (12 + -4a) + -5 + 2a = 13 Reorder the terms: 12 + -5 + -4a + 2a = 13 Combine like terms: 12 + -5 = 7 7 + -4a + 2a = 13 Combine like terms: -4a + 2a = -2a 7 + -2a = 13 Solving 7 + -2a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2a = 13 + -7 Combine like terms: 7 + -7 = 0 0 + -2a = 13 + -7 -2a = 13 + -7 Combine like terms: 13 + -7 = 6 -2a = 6 Divide each side by '-2'. a = -3 Simplifying a = -3
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