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Simplifying -9 + 7a + -11 = 3a Reorder the terms: -9 + -11 + 7a = 3a Combine like terms: -9 + -11 = -20 -20 + 7a = 3a Solving -20 + 7a = 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. -20 + 7a + -3a = 3a + -3a Combine like terms: 7a + -3a = 4a -20 + 4a = 3a + -3a Combine like terms: 3a + -3a = 0 -20 + 4a = 0 Add '20' to each side of the equation. -20 + 20 + 4a = 0 + 20 Combine like terms: -20 + 20 = 0 0 + 4a = 0 + 20 4a = 0 + 20 Combine like terms: 0 + 20 = 20 4a = 20 Divide each side by '4'. a = 5 Simplifying a = 5
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