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Simplifying 3a + -9 = a + 1 Reorder the terms: -9 + 3a = a + 1 Reorder the terms: -9 + 3a = 1 + a Solving -9 + 3a = 1 + 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 + 3a + -1a = 1 + a + -1a Combine like terms: 3a + -1a = 2a -9 + 2a = 1 + a + -1a Combine like terms: a + -1a = 0 -9 + 2a = 1 + 0 -9 + 2a = 1 Add '9' to each side of the equation. -9 + 9 + 2a = 1 + 9 Combine like terms: -9 + 9 = 0 0 + 2a = 1 + 9 2a = 1 + 9 Combine like terms: 1 + 9 = 10 2a = 10 Divide each side by '2'. a = 5 Simplifying a = 5
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