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Simplifying 3 + a = 4a + 12 Reorder the terms: 3 + a = 12 + 4a Solving 3 + a = 12 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 3 + a + -4a = 12 + 4a + -4a Combine like terms: a + -4a = -3a 3 + -3a = 12 + 4a + -4a Combine like terms: 4a + -4a = 0 3 + -3a = 12 + 0 3 + -3a = 12 Add '-3' to each side of the equation. 3 + -3 + -3a = 12 + -3 Combine like terms: 3 + -3 = 0 0 + -3a = 12 + -3 -3a = 12 + -3 Combine like terms: 12 + -3 = 9 -3a = 9 Divide each side by '-3'. a = -3 Simplifying a = -3
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