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Simplifying 18 = 7 + -1(a + 10) Reorder the terms: 18 = 7 + -1(10 + a) 18 = 7 + (10 * -1 + a * -1) 18 = 7 + (-10 + -1a) Combine like terms: 7 + -10 = -3 18 = -3 + -1a Solving 18 = -3 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 18 + a = -3 + -1a + a Combine like terms: -1a + a = 0 18 + a = -3 + 0 18 + a = -3 Add '-18' to each side of the equation. 18 + -18 + a = -3 + -18 Combine like terms: 18 + -18 = 0 0 + a = -3 + -18 a = -3 + -18 Combine like terms: -3 + -18 = -21 a = -21 Simplifying a = -21
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