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Simplifying -7a + 2a + 9 = 20 Reorder the terms: 9 + -7a + 2a = 20 Combine like terms: -7a + 2a = -5a 9 + -5a = 20 Solving 9 + -5a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -5a = 20 + -9 Combine like terms: 9 + -9 = 0 0 + -5a = 20 + -9 -5a = 20 + -9 Combine like terms: 20 + -9 = 11 -5a = 11 Divide each side by '-5'. a = -2.2 Simplifying a = -2.2
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