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)
(1/5)*N-3 = 12 // - 12
(1/5)*N-12-3 = 0
1/5*N-15 = 0 // + 15
1/5*N = 15 // : 1/5
N = 15/1/5
N = 75
N = 75
| -7m-6-7(m-1)=-(2m+3) | | 2/3y-1/4y=-5/12y+1/2 | | 14-8(a+2)=7+a | | 240=29x-4y | | 3=-5(x-6) | | 4x^2-2x+12= | | 4x/5=16 | | 7-9x=25-16x | | 0=8x-24 | | 3(x+8)=54 | | 1/5(z-5)=1/3(z+2) | | 2n-5=16 | | 3/2u=9 | | 9x+5=-4x | | -4w-19=7 | | 7x^2-10=32 | | 3/5u=15 | | -6y-10=-4y-12 | | -3=-9v+2 | | -4v-12=4v+20 | | 3x/4=21 | | (1/5)a-(1/5)=-5 | | 4y-3=7y-18 | | -5.2y+8=-7.6 | | -2w+14=-4w | | -5x^2-1=11x^2 | | h=-4.9t^2+120t | | 4x+3=-77 | | x^2-11x-14=0 | | -4z+21=-z | | x^2-12x+360=0 | | -5.2+8=-7.6 |