(1+5)^2*X-(1+6)*(1+5)^2*X+1+5=0 6^2*X-(1+6)*(1+5)^2*X+1+5=0 36*X-(1+6)*(1+5)^2*X+1+5=0 36*X-7*(1+5)^2*X+1+5=0 36*X-7*6^2*X+1+5=0 36*X-7*36*X+1+5=0 -216*X+1+5=0 -216*X+6=0 -216*X+6=0: X=-(-6)/216=6/216=1//36~~0.0277777777777778