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Ninth grade math smj answer
X-Y+30=0

Solution: If the water in barrel B is poured into barrel A, after barrel A is full, barrel B still has 10 liter of water.

So the total water number is equal to X+ 10.

If all the water in barrel A is poured into barrel B, barrel B can only hold 20 liters of water.

X+ 10+20=Y

X-Y+30=0