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Simplifying 20 + 2a = 100 + a Solving 20 + 2a = 100 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 20 + 2a + -1a = 100 + a + -1a Combine like terms: 2a + -1a = 1a 20 + 1a = 100 + a + -1a Combine like terms: a + -1a = 0 20 + 1a = 100 + 0 20 + 1a = 100 Add '-20' to each side of the equation. 20 + -20 + 1a = 100 + -20 Combine like terms: 20 + -20 = 0 0 + 1a = 100 + -20 1a = 100 + -20 Combine like terms: 100 + -20 = 80 1a = 80 Divide each side by '1'. a = 80 Simplifying a = 80
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