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Simplifying 15 = 7a + 3 + -8 Reorder the terms: 15 = 3 + -8 + 7a Combine like terms: 3 + -8 = -5 15 = -5 + 7a Solving 15 = -5 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 15 + -7a = -5 + 7a + -7a Combine like terms: 7a + -7a = 0 15 + -7a = -5 + 0 15 + -7a = -5 Add '-15' to each side of the equation. 15 + -15 + -7a = -5 + -15 Combine like terms: 15 + -15 = 0 0 + -7a = -5 + -15 -7a = -5 + -15 Combine like terms: -5 + -15 = -20 -7a = -20 Divide each side by '-7'. a = 2.857142857 Simplifying a = 2.857142857
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