If it's not what You are looking for type in the equation solver your own equation and let us solve it.
v in (-oo:+oo)
v/(-2) = -13 // + 13
v/(-2)+13 = 0
13-1/2*v = 0 // - 13
-1/2*v = -13 // : -1/2
v = -13/(-1/2)
v = 26
v = 26
| -28x^2-7x-10=0 | | 2x-(3*5)=20 | | y=6x^2+23x+20 | | 6(x+5)+2=(2x-5)+22 | | 3(k-2)-2k=-3+4 | | 8(8x-17)=312 | | 8(8x-17)=225 | | 5u+x=21 | | ln(4x-1)-ln(x^2+6)= | | 7(10x-2)=476 | | -1=-11+t | | 3x^2+7x+3=1 | | 23-3r=50 | | 3x(4+2y)-13x(-11+8y)= | | 5x^2-3x-12=-4 | | 5(8x-9)=355 | | b^2+3b-5=-7 | | 15y+7=62 | | 0.8x=2.7 | | 9m+2n-6m+10n= | | (5)/(2x-8) | | 26+7=36 | | logx=3.3 | | 2t+12=22 | | 8h-14=66 | | 9x^2+7x-5=3-7x | | 10(5x-7)=530 | | 10=x^3+7x^2+4x | | 6(8x+12)=504 | | r^2+7r+15=5 | | (7v-5)(v+3)=0 | | 5(9x-6)=285 |