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Simplifying 18.5 = a + -2.5 Reorder the terms: 18.5 = -2.5 + a Solving 18.5 = -2.5 + 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. 18.5 + -1a = -2.5 + a + -1a Combine like terms: a + -1a = 0 18.5 + -1a = -2.5 + 0 18.5 + -1a = -2.5 Add '-18.5' to each side of the equation. 18.5 + -18.5 + -1a = -2.5 + -18.5 Combine like terms: 18.5 + -18.5 = 0.0 0.0 + -1a = -2.5 + -18.5 -1a = -2.5 + -18.5 Combine like terms: -2.5 + -18.5 = -21 -1a = -21 Divide each side by '-1'. a = 21 Simplifying a = 21
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