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Simplifying -18 = 1 + -3a + -4 Reorder the terms: -18 = 1 + -4 + -3a Combine like terms: 1 + -4 = -3 -18 = -3 + -3a Solving -18 = -3 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -18 + 3a = -3 + -3a + 3a Combine like terms: -3a + 3a = 0 -18 + 3a = -3 + 0 -18 + 3a = -3 Add '18' to each side of the equation. -18 + 18 + 3a = -3 + 18 Combine like terms: -18 + 18 = 0 0 + 3a = -3 + 18 3a = -3 + 18 Combine like terms: -3 + 18 = 15 3a = 15 Divide each side by '3'. a = 5 Simplifying a = 5
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