10×X=7490 90900:X=10 X×10=40070

   10×X=7490 x=7490/10 x=749    90900:X=10 x=9090 X×10=40070 x=4007

10х=7490 90900:х= 10 х= 7490:10 х= 90900:10 х=749 х= 9090 х×10=40070 х= 40070:10 х = 4007