(х-5)*5=(х+5)*2*1,5
5х-25=3х+15
5х-3х=15+25
2х=40
х=40÷2
х=20 км/ч
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(х-5)*5=(х+5)*2*1,5
5х-25=3х+15
5х-3х=15+25
2х=40
х=40÷2
х=20 км/ч