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Simplifying 20 + -2a = 7a + 2 Reorder the terms: 20 + -2a = 2 + 7a Solving 20 + -2a = 2 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 20 + -2a + -7a = 2 + 7a + -7a Combine like terms: -2a + -7a = -9a 20 + -9a = 2 + 7a + -7a Combine like terms: 7a + -7a = 0 20 + -9a = 2 + 0 20 + -9a = 2 Add '-20' to each side of the equation. 20 + -20 + -9a = 2 + -20 Combine like terms: 20 + -20 = 0 0 + -9a = 2 + -20 -9a = 2 + -20 Combine like terms: 2 + -20 = -18 -9a = -18 Divide each side by '-9'. a = 2 Simplifying a = 2
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