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Simplifying 7a + -4 = 31 Reorder the terms: -4 + 7a = 31 Solving -4 + 7a = 31 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 7a = 31 + 4 Combine like terms: -4 + 4 = 0 0 + 7a = 31 + 4 7a = 31 + 4 Combine like terms: 31 + 4 = 35 7a = 35 Divide each side by '7'. a = 5 Simplifying a = 5
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