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Simplifying 15 + 3 = a Combine like terms: 15 + 3 = 18 18 = a Solving 18 = 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 = a + -1a Combine like terms: a + -1a = 0 18 + -1a = 0 Add '-18' to each side of the equation. 18 + -18 + -1a = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -1a = 0 + -18 -1a = 0 + -18 Combine like terms: 0 + -18 = -18 -1a = -18 Divide each side by '-1'. a = 18 Simplifying a = 18
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