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Simplifying 7(3a + -1) = 9 Reorder the terms: 7(-1 + 3a) = 9 (-1 * 7 + 3a * 7) = 9 (-7 + 21a) = 9 Solving -7 + 21a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 21a = 9 + 7 Combine like terms: -7 + 7 = 0 0 + 21a = 9 + 7 21a = 9 + 7 Combine like terms: 9 + 7 = 16 21a = 16 Divide each side by '21'. a = 0.7619047619 Simplifying a = 0.7619047619
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