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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 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 = -54 8a = -54 Divide each side by '8'. a = -6.75 Simplifying a = -6.75
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