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Simplifying -20 = -5(a + 7) Reorder the terms: -20 = -5(7 + a) -20 = (7 * -5 + a * -5) -20 = (-35 + -5a) Solving -20 = -35 + -5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5a' to each side of the equation. -20 + 5a = -35 + -5a + 5a Combine like terms: -5a + 5a = 0 -20 + 5a = -35 + 0 -20 + 5a = -35 Add '20' to each side of the equation. -20 + 20 + 5a = -35 + 20 Combine like terms: -20 + 20 = 0 0 + 5a = -35 + 20 5a = -35 + 20 Combine like terms: -35 + 20 = -15 5a = -15 Divide each side by '5'. a = -3 Simplifying a = -3
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