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Simplifying 12 + -0.5a = -31 Solving 12 + -0.5a = -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 + -0.5a = -31 + -12 Combine like terms: 12 + -12 = 0 0 + -0.5a = -31 + -12 -0.5a = -31 + -12 Combine like terms: -31 + -12 = -43 -0.5a = -43 Divide each side by '-0.5'. a = 86 Simplifying a = 86
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