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Simplifying -7a + 8 + 4 = 31 Reorder the terms: 8 + 4 + -7a = 31 Combine like terms: 8 + 4 = 12 12 + -7a = 31 Solving 12 + -7a = 31 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -7a = 31 + -12 Combine like terms: 12 + -12 = 0 0 + -7a = 31 + -12 -7a = 31 + -12 Combine like terms: 31 + -12 = 19 -7a = 19 Divide each side by '-7'. a = -2.714285714 Simplifying a = -2.714285714
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