If it's not what You are looking for type in the equation solver your own equation and let us solve it.
s in (-oo:+oo)
15 = s/13 // - s/13
15-(s/13) = 0
15-1/13*s = 0 // - 15
-1/13*s = -15 // : -1/13
s = -15/(-1/13)
s = 195
s = 195
| T/4=0 | | f(x)=x^2+4x+5 | | x^2-3x+9x+13=180 | | -6x+8y=9 | | M/-6=-10 | | f(x)=-9x^2+5x+1 | | (k-5)(k+3)=0 | | (2x+3)(x-3)=0 | | 7(x-5)=3x+1 | | 4(x+3)=5x | | y=x^2+5-4x | | -r^2+10r-21=0 | | 4n^2-7n-2=0 | | y-0=2x+12 | | 2x^3-13x^2+35x=0 | | n^2=-32-12n | | f(x)=-9x^2+4x+9 | | u+5.5=8.19 | | y=5x^2+10x-6 | | f(x)=-7x^2+8x+7 | | (8/x)=(3/5) | | y=x+5x^2+9 | | 3(5-2x)=2(6-3x)-10x | | 72x-26x^2-27=0 | | 12x-21=6x-9 | | f(x)=-5x^2+7x+8 | | 5y+3(y+50)=1750 | | 456/500 | | 14=6+k/8 | | x/4-7=-9 | | 0.50*0.54= | | 0.5*0.54= |