7 gal 1 qts = 7*4 + 1 = 29 qts
2 gal 3 qts = 2*4 + 3 = 11 qts
so diff = 29 - 11 = 18 qts = 4 gal 2 qts.
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3 gal, 2 qt
A negative minus a positive is a negative. i.e -1-(+1)= -2
x2 - x - 2 = 0(x - 2)(x + 1) = 0x = 2 and -1
2/5 = 4/10 minus 1/10 is 3/10
2/3 - 12 = -11 1/3 or minus eleven and one third.