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n in (-oo:+oo)
2*(5*n+10) = (61/2)*n+(3/12)*n+2*10 // - (61/2)*n+(3/12)*n+2*10
2*(5*n+10)-((61/2)*n)-((3/12)*n)-(2*10) = 0
2*(5*n+10)+(-61/2)*n+(-1/4)*n-20 = 0
2*(5*n+10)+(-61*n)/2-n/4-20 = 0
(4*2^2*(5*n+10))/(2*4)+(-61*4*n)/(2*4)+(2*(-n))/(2*4)+(-20*2*4)/(2*4) = 0
4*2^2*(5*n+10)-61*4*n+2*(-n)-20*2*4 = 0
160-164*n-2*n-160 = 0
160-166*n-160 = 0
-166*n = 0
(-166*n)/(2*4) = 0
(-166*n)/(2*4) = 0 // * 2*4
-166*n = 0
-166*n = 0 // : -166
n = 0
n = 0
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