(500-x)*6=120 600:2+n=400
500-x=120:6 600:2=300
500-x=20 n=400-300
x=500-20 n=100
x=480 600:2+100=400
(500-480)*6=120
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(500-x)*6=120 600:2+n=400
500-x=120:6 600:2=300
500-x=20 n=400-300
x=500-20 n=100
x=480 600:2+100=400
(500-480)*6=120