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Simplifying 20 = a + 4a Combine like terms: a + 4a = 5a 20 = 5a Solving 20 = 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 = 5a + -5a Combine like terms: 5a + -5a = 0 20 + -5a = 0 Add '-20' to each side of the equation. 20 + -20 + -5a = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -5a = 0 + -20 -5a = 0 + -20 Combine like terms: 0 + -20 = -20 -5a = -20 Divide each side by '-5'. a = 4 Simplifying a = 4
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