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Simplifying 9 + 7a = 1 + 3a Solving 9 + 7a = 1 + 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. 9 + 7a + -3a = 1 + 3a + -3a Combine like terms: 7a + -3a = 4a 9 + 4a = 1 + 3a + -3a Combine like terms: 3a + -3a = 0 9 + 4a = 1 + 0 9 + 4a = 1 Add '-9' to each side of the equation. 9 + -9 + 4a = 1 + -9 Combine like terms: 9 + -9 = 0 0 + 4a = 1 + -9 4a = 1 + -9 Combine like terms: 1 + -9 = -8 4a = -8 Divide each side by '4'. a = -2 Simplifying a = -2
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