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Simplifying -12 + 2a + -18 = 90 Reorder the terms: -12 + -18 + 2a = 90 Combine like terms: -12 + -18 = -30 -30 + 2a = 90 Solving -30 + 2a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 2a = 90 + 30 Combine like terms: -30 + 30 = 0 0 + 2a = 90 + 30 2a = 90 + 30 Combine like terms: 90 + 30 = 120 2a = 120 Divide each side by '2'. a = 60 Simplifying a = 60
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