There are two piles of coal. There are 20 tons of coal in pile a and 17.5 tons of coal in pile B. 2 tons of coal in pile a and 1.5 tons of coal in pile B are used every day. How many days The remaining equality equation solution of the last two piles of coal

Let X be equal to the rest of the two piles of coal
20-2x=17.5-1.5x
0.5x=2.5
x=5
A: five days later, the remaining coal of the two piles is equal

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