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Simplifying a + 20 = 2a + 10 Reorder the terms: 20 + a = 2a + 10 Reorder the terms: 20 + a = 10 + 2a Solving 20 + a = 10 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 20 + a + -2a = 10 + 2a + -2a Combine like terms: a + -2a = -1a 20 + -1a = 10 + 2a + -2a Combine like terms: 2a + -2a = 0 20 + -1a = 10 + 0 20 + -1a = 10 Add '-20' to each side of the equation. 20 + -20 + -1a = 10 + -20 Combine like terms: 20 + -20 = 0 0 + -1a = 10 + -20 -1a = 10 + -20 Combine like terms: 10 + -20 = -10 -1a = -10 Divide each side by '-1'. a = 10 Simplifying a = 10
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