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Simplifying 12.4 = a + (-7.9) 12.4 = a + -7.9 Reorder the terms: 12.4 = -7.9 + a Solving 12.4 = -7.9 + 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. 12.4 + -1a = -7.9 + a + -1a Combine like terms: a + -1a = 0 12.4 + -1a = -7.9 + 0 12.4 + -1a = -7.9 Add '-12.4' to each side of the equation. 12.4 + -12.4 + -1a = -7.9 + -12.4 Combine like terms: 12.4 + -12.4 = 0.0 0.0 + -1a = -7.9 + -12.4 -1a = -7.9 + -12.4 Combine like terms: -7.9 + -12.4 = -20.3 -1a = -20.3 Divide each side by '-1'. a = 20.3 Simplifying a = 20.3
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