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Simplifying 5a + 7 + 8a = -20 Reorder the terms: 7 + 5a + 8a = -20 Combine like terms: 5a + 8a = 13a 7 + 13a = -20 Solving 7 + 13a = -20 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 + 13a = -20 + -7 Combine like terms: 7 + -7 = 0 0 + 13a = -20 + -7 13a = -20 + -7 Combine like terms: -20 + -7 = -27 13a = -27 Divide each side by '13'. a = -2.076923077 Simplifying a = -2.076923077
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