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Simplifying 18 = 3 + -3a Solving 18 = 3 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. 18 + 3a = 3 + -3a + 3a Combine like terms: -3a + 3a = 0 18 + 3a = 3 + 0 18 + 3a = 3 Add '-18' to each side of the equation. 18 + -18 + 3a = 3 + -18 Combine like terms: 18 + -18 = 0 0 + 3a = 3 + -18 3a = 3 + -18 Combine like terms: 3 + -18 = -15 3a = -15 Divide each side by '3'. a = -5 Simplifying a = -5
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