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Simplifying 20 + -1a = 10a + -2 Reorder the terms: 20 + -1a = -2 + 10a Solving 20 + -1a = -2 + 10a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10a' to each side of the equation. 20 + -1a + -10a = -2 + 10a + -10a Combine like terms: -1a + -10a = -11a 20 + -11a = -2 + 10a + -10a Combine like terms: 10a + -10a = 0 20 + -11a = -2 + 0 20 + -11a = -2 Add '-20' to each side of the equation. 20 + -20 + -11a = -2 + -20 Combine like terms: 20 + -20 = 0 0 + -11a = -2 + -20 -11a = -2 + -20 Combine like terms: -2 + -20 = -22 -11a = -22 Divide each side by '-11'. a = 2 Simplifying a = 2

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