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Simplifying -12.9 = a + 0.7 Reorder the terms: -12.9 = 0.7 + a Solving -12.9 = 0.7 + 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. -12.9 + -1a = 0.7 + a + -1a Combine like terms: a + -1a = 0 -12.9 + -1a = 0.7 + 0 -12.9 + -1a = 0.7 Add '12.9' to each side of the equation. -12.9 + 12.9 + -1a = 0.7 + 12.9 Combine like terms: -12.9 + 12.9 = 0.0 0.0 + -1a = 0.7 + 12.9 -1a = 0.7 + 12.9 Combine like terms: 0.7 + 12.9 = 13.6 -1a = 13.6 Divide each side by '-1'. a = -13.6 Simplifying a = -13.6
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