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Simplifying 12 = a + -21.4 Reorder the terms: 12 = -21.4 + a Solving 12 = -21.4 + 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 = -21.4 + a + -1a Combine like terms: a + -1a = 0 12 + -1a = -21.4 + 0 12 + -1a = -21.4 Add '-12' to each side of the equation. 12 + -12 + -1a = -21.4 + -12 Combine like terms: 12 + -12 = 0 0 + -1a = -21.4 + -12 -1a = -21.4 + -12 Combine like terms: -21.4 + -12 = -33.4 -1a = -33.4 Divide each side by '-1'. a = 33.4 Simplifying a = 33.4
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