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Simplifying 18 = 7s + 2a Reorder the terms: 18 = 2a + 7s Solving 18 = 2a + 7s Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 18 + -2a = 2a + -2a + 7s Combine like terms: 2a + -2a = 0 18 + -2a = 0 + 7s 18 + -2a = 7s Add '-18' to each side of the equation. 18 + -18 + -2a = -18 + 7s Combine like terms: 18 + -18 = 0 0 + -2a = -18 + 7s -2a = -18 + 7s Divide each side by '-2'. a = 9 + -3.5s Simplifying a = 9 + -3.5s
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