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Simplifying -3a + -3(3a + -6) = 90 Reorder the terms: -3a + -3(-6 + 3a) = 90 -3a + (-6 * -3 + 3a * -3) = 90 -3a + (18 + -9a) = 90 Reorder the terms: 18 + -3a + -9a = 90 Combine like terms: -3a + -9a = -12a 18 + -12a = 90 Solving 18 + -12a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -12a = 90 + -18 Combine like terms: 18 + -18 = 0 0 + -12a = 90 + -18 -12a = 90 + -18 Combine like terms: 90 + -18 = 72 -12a = 72 Divide each side by '-12'. a = -6 Simplifying a = -6
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