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Simplifying 18 = a + -3.9 Reorder the terms: 18 = -3.9 + a Solving 18 = -3.9 + 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. 18 + -1a = -3.9 + a + -1a Combine like terms: a + -1a = 0 18 + -1a = -3.9 + 0 18 + -1a = -3.9 Add '-18' to each side of the equation. 18 + -18 + -1a = -3.9 + -18 Combine like terms: 18 + -18 = 0 0 + -1a = -3.9 + -18 -1a = -3.9 + -18 Combine like terms: -3.9 + -18 = -21.9 -1a = -21.9 Divide each side by '-1'. a = 21.9 Simplifying a = 21.9
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