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Simplifying 20 + -2a = 9a + -2 Reorder the terms: 20 + -2a = -2 + 9a Solving 20 + -2a = -2 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. 20 + -2a + -9a = -2 + 9a + -9a Combine like terms: -2a + -9a = -11a 20 + -11a = -2 + 9a + -9a Combine like terms: 9a + -9a = 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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