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Simplifying 3a + -7 = 12 + 4a Reorder the terms: -7 + 3a = 12 + 4a Solving -7 + 3a = 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. -7 + 3a + -4a = 12 + 4a + -4a Combine like terms: 3a + -4a = -1a -7 + -1a = 12 + 4a + -4a Combine like terms: 4a + -4a = 0 -7 + -1a = 12 + 0 -7 + -1a = 12 Add '7' to each side of the equation. -7 + 7 + -1a = 12 + 7 Combine like terms: -7 + 7 = 0 0 + -1a = 12 + 7 -1a = 12 + 7 Combine like terms: 12 + 7 = 19 -1a = 19 Divide each side by '-1'. a = -19 Simplifying a = -19
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