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Simplifying 7 + 4(2a + 15) = (-13) Reorder the terms: 7 + 4(15 + 2a) = (-13) 7 + (15 * 4 + 2a * 4) = (-13) 7 + (60 + 8a) = (-13) Combine like terms: 7 + 60 = 67 67 + 8a = (-13) 67 + 8a = -13 Solving 67 + 8a = -13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-67' to each side of the equation. 67 + -67 + 8a = -13 + -67 Combine like terms: 67 + -67 = 0 0 + 8a = -13 + -67 8a = -13 + -67 Combine like terms: -13 + -67 = -80 8a = -80 Divide each side by '8'. a = -10 Simplifying a = -10
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