12+8,3х+1,5х=95,3
9,8х=95,3-12
9,8х=83,3
х=83,3/9,8
х=8,5
Проверяем: 12+8,3*8,5+1,5*8,5=95,3
12+70,55+12,75=95,3
95,3=95,3
<span>391500+870*450--</span><span>261*1500-(</span><span>87945-487957)=791512</span>