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Simplifying 20 + -2a = 56 + -5a Solving 20 + -2a = 56 + -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 + -2a + 5a = 56 + -5a + 5a Combine like terms: -2a + 5a = 3a 20 + 3a = 56 + -5a + 5a Combine like terms: -5a + 5a = 0 20 + 3a = 56 + 0 20 + 3a = 56 Add '-20' to each side of the equation. 20 + -20 + 3a = 56 + -20 Combine like terms: 20 + -20 = 0 0 + 3a = 56 + -20 3a = 56 + -20 Combine like terms: 56 + -20 = 36 3a = 36 Divide each side by '3'. a = 12 Simplifying a = 12
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