Question

((14-х)10+х):(х-(14-х))=14

Answer 1

(140+14х-10х-х^2)/(x-14+x)=14;
(-x^2+4x+140)/14=14|*14;
-x^2+4x+140=144;
-x^2+4x-4=0|(-1);
x^2-4x+4=0;
x=2;