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Simplifying 3a + a + -2 = -18 Reorder the terms: -2 + 3a + a = -18 Combine like terms: 3a + a = 4a -2 + 4a = -18 Solving -2 + 4a = -18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 4a = -18 + 2 Combine like terms: -2 + 2 = 0 0 + 4a = -18 + 2 4a = -18 + 2 Combine like terms: -18 + 2 = -16 4a = -16 Divide each side by '4'. a = -4 Simplifying a = -4
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