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Simplifying 9a + -20 = 5a + 2a Reorder the terms: -20 + 9a = 5a + 2a Combine like terms: 5a + 2a = 7a -20 + 9a = 7a Solving -20 + 9a = 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 + 9a + -7a = 7a + -7a Combine like terms: 9a + -7a = 2a -20 + 2a = 7a + -7a Combine like terms: 7a + -7a = 0 -20 + 2a = 0 Add '20' to each side of the equation. -20 + 20 + 2a = 0 + 20 Combine like terms: -20 + 20 = 0 0 + 2a = 0 + 20 2a = 0 + 20 Combine like terms: 0 + 20 = 20 2a = 20 Divide each side by '2'. a = 10 Simplifying a = 10
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