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Simplifying 3a + -4 = 77 + -6a Reorder the terms: -4 + 3a = 77 + -6a Solving -4 + 3a = 77 + -6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6a' to each side of the equation. -4 + 3a + 6a = 77 + -6a + 6a Combine like terms: 3a + 6a = 9a -4 + 9a = 77 + -6a + 6a Combine like terms: -6a + 6a = 0 -4 + 9a = 77 + 0 -4 + 9a = 77 Add '4' to each side of the equation. -4 + 4 + 9a = 77 + 4 Combine like terms: -4 + 4 = 0 0 + 9a = 77 + 4 9a = 77 + 4 Combine like terms: 77 + 4 = 81 9a = 81 Divide each side by '9'. a = 9 Simplifying a = 9
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