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Simplifying a + 2(a + -30) = 90 Reorder the terms: a + 2(-30 + a) = 90 a + (-30 * 2 + a * 2) = 90 a + (-60 + 2a) = 90 Reorder the terms: -60 + a + 2a = 90 Combine like terms: a + 2a = 3a -60 + 3a = 90 Solving -60 + 3a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '60' to each side of the equation. -60 + 60 + 3a = 90 + 60 Combine like terms: -60 + 60 = 0 0 + 3a = 90 + 60 3a = 90 + 60 Combine like terms: 90 + 60 = 150 3a = 150 Divide each side by '3'. a = 50 Simplifying a = 50
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