The inverse operation of division is multiplication.
Sallys statement is always true
for example:
-6 + 2 = -4
but if I turn it around
2 - 6 = -4
same answer
-6 -6 = -12
swap around -6 - 6 = 12
same answer
again -3 + 6 = 3
and 6 - 3 = 3
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I think it would be 72+4x=400
400-72= 328
328/4= 82
So the answer would be 82=x
