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Simplifying 4 + 2a + -7 = -12 Reorder the terms: 4 + -7 + 2a = -12 Combine like terms: 4 + -7 = -3 -3 + 2a = -12 Solving -3 + 2a = -12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 2a = -12 + 3 Combine like terms: -3 + 3 = 0 0 + 2a = -12 + 3 2a = -12 + 3 Combine like terms: -12 + 3 = -9 2a = -9 Divide each side by '2'. a = -4.5 Simplifying a = -4.5
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