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Simplifying 6a + -3(3a + -4) = 30 Reorder the terms: 6a + -3(-4 + 3a) = 30 6a + (-4 * -3 + 3a * -3) = 30 6a + (12 + -9a) = 30 Reorder the terms: 12 + 6a + -9a = 30 Combine like terms: 6a + -9a = -3a 12 + -3a = 30 Solving 12 + -3a = 30 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -3a = 30 + -12 Combine like terms: 12 + -12 = 0 0 + -3a = 30 + -12 -3a = 30 + -12 Combine like terms: 30 + -12 = 18 -3a = 18 Divide each side by '-3'. a = -6 Simplifying a = -6
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