(580:b-25)*90+490=850
(580:b-25)*90=360
(580:b-25)=360:90
580:b-25=4
580:b=25+4
580:b=29
b=580:29
b=20
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(580:b-25)*90+490=850
(580:b-25)*90=360
(580:b-25)=360:90
580:b-25=4
580:b=25+4
580:b=29
b=580:29
b=20