6,7х+13+3,1х=86,5
6,7х+3,1х=86,5-13
9,8х=73,5
Х=73,5/9,8=735/98
Х=7,5
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ч=9,8x+13=86,5
9,8x=73,5
x=73,5:9,8
х=7.5
6,7х+13+3,1х=86,5
6,7х+3,1х=86,5-13
9,8х=73,5
Х=73,5/9,8=735/98
Х=7,5