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Simplifying 28 = 4(-5 + 2a) 28 = (-5 * 4 + 2a * 4) 28 = (-20 + 8a) Solving 28 = -20 + 8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8a' to each side of the equation. 28 + -8a = -20 + 8a + -8a Combine like terms: 8a + -8a = 0 28 + -8a = -20 + 0 28 + -8a = -20 Add '-28' to each side of the equation. 28 + -28 + -8a = -20 + -28 Combine like terms: 28 + -28 = 0 0 + -8a = -20 + -28 -8a = -20 + -28 Combine like terms: -20 + -28 = -48 -8a = -48 Divide each side by '-8'. a = 6 Simplifying a = 6
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