<span>у*94+348=15858</span>
<span>у*94 = 15858 - 348</span>
<span>у*94 = 15510</span>
<span>y = 15510 : 94</span>
<span>y = 165 </span>
<span>____________________</span>
(с+217)*12=10032.
(с+217) = 10032 : 12
с + 217 = 836
с = 836 - 217
с = 619