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Simplifying -20 = -4(a + 1) Reorder the terms: -20 = -4(1 + a) -20 = (1 * -4 + a * -4) -20 = (-4 + -4a) Solving -20 = -4 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. -20 + 4a = -4 + -4a + 4a Combine like terms: -4a + 4a = 0 -20 + 4a = -4 + 0 -20 + 4a = -4 Add '20' to each side of the equation. -20 + 20 + 4a = -4 + 20 Combine like terms: -20 + 20 = 0 0 + 4a = -4 + 20 4a = -4 + 20 Combine like terms: -4 + 20 = 16 4a = 16 Divide each side by '4'. a = 4 Simplifying a = 4
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