If it's not what You are looking for type in the equation solver your own equation and let us solve it.
n in (-oo:+oo)
(n+75+81)/3 = 80 // - 80
(n+75+81)/3-80 = 0
(n+156)/3-80 = 0
(n+156)/3+(-80*3)/3 = 0
n-80*3+156 = 0
n-84 = 0
(n-84)/3 = 0
(n-84)/3 = 0 // * 3
n-84 = 0
n-84 = 0 // + 84
n = 84
n = 84
| (7-w)(3w+2)=0 | | 12p^2-2p-13=0 | | 15/k=5 | | 3/(75+81+n)=80 | | -3y+2y+6=-2y+5-3y+16 | | 36x*36x-25=0 | | 2.4+16.4q=4(4.3q+1) | | 45+y=8*v | | 8(6f+9c-9p)= | | 5y-4m=19 | | 6/w+3-5=2w-2/w+3 | | 19-y=9c | | 4/7z+2/3z=13 | | -5+5x=12x+5 | | -7y*-9y= | | 22+3(a+6)=4(3a+5) | | 108x5/12 | | -9x^3+24x^10=equation | | 3(4+4g)=12g+12 | | (-9)+7= | | X/2=7/10 | | 5(-9a+8b)-8(-6a+3b)-2=X | | y^2+4y^1+6xy=0 | | f(x)=10x+1+x(-9x+3) | | 5+3*7+(5-3)^2/(7-3) | | 3x^2=6+3x | | x+(x*0.19)=41 | | (0.216)-2/3 | | x+2+15=105 | | 7+4n=(5n-1) | | x/2-1=30 | | x-2+x-2=6(x-3) |