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Simplifying 18 = a + -1(-19) Multiply -1 * -19 18 = a + 19 Reorder the terms: 18 = 19 + a Solving 18 = 19 + 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 = 19 + a + -1a Combine like terms: a + -1a = 0 18 + -1a = 19 + 0 18 + -1a = 19 Add '-18' to each side of the equation. 18 + -18 + -1a = 19 + -18 Combine like terms: 18 + -18 = 0 0 + -1a = 19 + -18 -1a = 19 + -18 Combine like terms: 19 + -18 = 1 -1a = 1 Divide each side by '-1'. a = -1 Simplifying a = -1
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