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Simplifying -12 = a + -21 Reorder the terms: -12 = -21 + a Solving -12 = -21 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -12 + -1a = -21 + a + -1a Combine like terms: a + -1a = 0 -12 + -1a = -21 + 0 -12 + -1a = -21 Add '12' to each side of the equation. -12 + 12 + -1a = -21 + 12 Combine like terms: -12 + 12 = 0 0 + -1a = -21 + 12 -1a = -21 + 12 Combine like terms: -21 + 12 = -9 -1a = -9 Divide each side by '-1'. a = 9 Simplifying a = 9
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