HateMath!: containing 550 liter of water is being filled with water at the rate of 75 liter per minute
550L+x*75L/min = 550+x*75 HateMath!: 75 liter per minute from a full 1600 liter tank
1600L-75L/min = 1600-x*75 HateMath!: How lon will it be before the two tanks have the same amount of water?
[input]550+x*75 = 1600-x*75[/input]
[input]plot( 550+x*75, 1600-x*75, x=0..10)[/input]
550+x*75 = 1600-x*75
|-1600 550+x*75 -1600 = 1600-x*75-1600
-1050+x*75 = -x*75
| +x*75 -1050+x*75+x*75 = 0
| +1050 2*(x*75) = 1050
| /2 x*75 = 525
| / 75 x = 525 / 75
x = 7
+3146 
