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Simplifying -3(3 + -7a) + 3(3a + -9) = x (3 * -3 + -7a * -3) + 3(3a + -9) = x (-9 + 21a) + 3(3a + -9) = x Reorder the terms: -9 + 21a + 3(-9 + 3a) = x -9 + 21a + (-9 * 3 + 3a * 3) = x -9 + 21a + (-27 + 9a) = x Reorder the terms: -9 + -27 + 21a + 9a = x Combine like terms: -9 + -27 = -36 -36 + 21a + 9a = x Combine like terms: 21a + 9a = 30a -36 + 30a = x Solving -36 + 30a = x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 30a = 36 + x Combine like terms: -36 + 36 = 0 0 + 30a = 36 + x 30a = 36 + x Divide each side by '30'. a = 1.2 + 0.03333333333x Simplifying a = 1.2 + 0.03333333333x
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