(2*х+1)*0,65=1,3*2,5
(2*х+1)*0,65=3,25
2*х+1=3,25/0.65
2*х+1=5
2*х=4
х=2
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(2*х+1)*0,65=1,3*2,5
(2*х+1)*0,65=3,25
2*х+1=3,25/0.65
2*х+1=5
2*х=4
х=2