1 7 -8 = 0
2.1 subtracting a whole from fraction
rewrite the whole as a fraction using 7 as the denominator.
8 = 8 8 divided by 7
_ = ________
7 7
1 - ( 8 divided by 7 ) -55
__________________ = _____
7 7
-55
____ = 0
7
-55
____ divded by 7 = 0 divided by 7
7
-55 = 0
a non-zero constant never equals zero
