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Simplifying 3(2a + -7) + 9 = 30 Reorder the terms: 3(-7 + 2a) + 9 = 30 (-7 * 3 + 2a * 3) + 9 = 30 (-21 + 6a) + 9 = 30 Reorder the terms: -21 + 9 + 6a = 30 Combine like terms: -21 + 9 = -12 -12 + 6a = 30 Solving -12 + 6a = 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 + 6a = 30 + 12 Combine like terms: -12 + 12 = 0 0 + 6a = 30 + 12 6a = 30 + 12 Combine like terms: 30 + 12 = 42 6a = 42 Divide each side by '6'. a = 7 Simplifying a = 7
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