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