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Simplifying -5(a + 4) = 15 Reorder the terms: -5(4 + a) = 15 (4 * -5 + a * -5) = 15 (-20 + -5a) = 15 Solving -20 + -5a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -5a = 15 + 20 Combine like terms: -20 + 20 = 0 0 + -5a = 15 + 20 -5a = 15 + 20 Combine like terms: 15 + 20 = 35 -5a = 35 Divide each side by '-5'. a = -7 Simplifying a = -7
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