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Simplifying 12 + -2a = 28 Solving 12 + -2a = 28 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 + -2a = 28 + -12 Combine like terms: 12 + -12 = 0 0 + -2a = 28 + -12 -2a = 28 + -12 Combine like terms: 28 + -12 = 16 -2a = 16 Divide each side by '-2'. a = -8 Simplifying a = -8
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