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Simplifying 12a + -8a + -7 = -21 Reorder the terms: -7 + 12a + -8a = -21 Combine like terms: 12a + -8a = 4a -7 + 4a = -21 Solving -7 + 4a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4a = -21 + 7 Combine like terms: -7 + 7 = 0 0 + 4a = -21 + 7 4a = -21 + 7 Combine like terms: -21 + 7 = -14 4a = -14 Divide each side by '4'. a = -3.5 Simplifying a = -3.5
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