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Simplifying 7(3a + -1) = 91 Reorder the terms: 7(-1 + 3a) = 91 (-1 * 7 + 3a * 7) = 91 (-7 + 21a) = 91 Solving -7 + 21a = 91 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 = 91 + 7 Combine like terms: -7 + 7 = 0 0 + 21a = 91 + 7 21a = 91 + 7 Combine like terms: 91 + 7 = 98 21a = 98 Divide each side by '21'. a = 4.666666667 Simplifying a = 4.666666667
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