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Simplifying 4a + -9 = a + 9 Reorder the terms: -9 + 4a = a + 9 Reorder the terms: -9 + 4a = 9 + a Solving -9 + 4a = 9 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -9 + 4a + -1a = 9 + a + -1a Combine like terms: 4a + -1a = 3a -9 + 3a = 9 + a + -1a Combine like terms: a + -1a = 0 -9 + 3a = 9 + 0 -9 + 3a = 9 Add '9' to each side of the equation. -9 + 9 + 3a = 9 + 9 Combine like terms: -9 + 9 = 0 0 + 3a = 9 + 9 3a = 9 + 9 Combine like terms: 9 + 9 = 18 3a = 18 Divide each side by '3'. a = 6 Simplifying a = 6
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