720:(y:7+80)=6
720:(1/7y+80)=6
720:y+560/7=6
720*7/y+560=6
5040/y+560=6
5040=6(y+560)
840=y+560
-y=560-840
-y=-280
y=280
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720:(y:7+80)=6
720:(1/7y+80)=6
720:y+560/7=6
720*7/y+560=6
5040/y+560=6
5040=6(y+560)
840=y+560
-y=560-840
-y=-280
y=280