If it's not what You are looking for type in the equation solver your own equation and let us solve it.
c in (-oo:+oo)
-c/3-20 = 0
-1/3*c-20 = 0 // + 20
-1/3*c = 20 // : -1/3
c = 20/(-1/3)
c = -60
c = -60
| 9(d-7)=8 | | -2+(-1/2) | | .5x+1=1.5 | | 5x+8=4x+4 | | 9x+82=1 | | 2y-14=7+7y | | 5x^2-30x-12=y | | =0.8571428571+0.4285714286y | | 7x=3y+6 | | -1/2+(-2) | | 2q-3=27 | | x^2+25x+10=0 | | n+6.3= | | (4y+4)-(2+3y)=9 | | -1/2+2 | | 1/4/9/8 | | 1/2*1 | | 3m-9=15 | | 3x-1=8x+2 | | -23+10=3x+5-2x | | 4(3b-2)=5(2b+4) | | 10x+2(2-x)=8x+4 | | -4(x+3)-41=1-34 | | 4x+(x-1)=19 | | 6/35-2/15 | | -1/2*-2 | | 2x+7x=45 | | 4x+2yi=8+6i | | 5-1/2(6-6)=4 | | 6x+11=11x-12 | | 9-2n=3n | | 2x-5=3x-6 |