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Simplifying 12 = a + -1(-18) Multiply -1 * -18 12 = a + 18 Reorder the terms: 12 = 18 + a Solving 12 = 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. 12 + -1a = 18 + a + -1a Combine like terms: a + -1a = 0 12 + -1a = 18 + 0 12 + -1a = 18 Add '-12' to each side of the equation. 12 + -12 + -1a = 18 + -12 Combine like terms: 12 + -12 = 0 0 + -1a = 18 + -12 -1a = 18 + -12 Combine like terms: 18 + -12 = 6 -1a = 6 Divide each side by '-1'. a = -6 Simplifying a = -6
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