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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 = 37 -1a = 37 Divide each side by '-1'. a = -37 Simplifying a = -37
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