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Simplifying 2a + -4 = 77 + -7a Reorder the terms: -4 + 2a = 77 + -7a Solving -4 + 2a = 77 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. -4 + 2a + 7a = 77 + -7a + 7a Combine like terms: 2a + 7a = 9a -4 + 9a = 77 + -7a + 7a Combine like terms: -7a + 7a = 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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