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Simplifying 7(3x + -1) = 91 Reorder the terms: 7(-1 + 3x) = 91 (-1 * 7 + 3x * 7) = 91 (-7 + 21x) = 91 Solving -7 + 21x = 91 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 21x = 91 + 7 Combine like terms: -7 + 7 = 0 0 + 21x = 91 + 7 21x = 91 + 7 Combine like terms: 91 + 7 = 98 21x = 98 Divide each side by '21'. x = 4.666666667 Simplifying x = 4.666666667
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