by Eric (Florham Park, NJ)

(x+13)/y = 9Multiply both sides of the equation by yy×(x + 13)/y = 9 × ySimplifyx + 13 = 9yMinus 13 from both sides of the equationx + 13 - 13 = 9y - 13x + 0 = 9y - 13x = 9y - 13

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