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A barge takes 4 hours to move (at a constant rate) downstream for 32 miles, helped by a current of 2 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.

You are earning extra money drawing sketches for your friends and family. You receive $12 per sketch. Your expenses for art supplies are $50. Suppose you plan to spend an additional $7 per sketch for a frame. Write an equation that models only your expenses.

(x+3)/(x-2)=(x+4)/(x-3).