If it's not what You are looking for type in the equation solver your own equation and let us solve it.
d in (-oo:+oo)
d/3 = 13 // - 13
d/3-13 = 0
1/3*d-13 = 0 // + 13
1/3*d = 13 // : 1/3
d = 13/1/3
d = 39
d = 39
| a=x(50-x) | | a=(50-x) | | 9/x=1.25 | | 5c+3=45 | | x*4.8=8.4 | | 6.3y= | | -3(4x+5)=33 | | 3x-18=3x-18 | | 18x+4=3x-12 | | x*1.8=54 | | 9st-12st= | | 7cos(x)=9 | | -10d^2-3d+18= | | 4x+4x+1=80 | | 2x+1+3*2x+6*2x-1=32 | | 3x+1-5*3x-1=36 | | 6x-4i=6x-12u | | x/8-9=2 | | 5x+5y+8z-2x+4z+8y= | | (2/16)*10 | | 2720=34x^2+68x | | 1/5(x-y)=1 | | 648=a^4*b^3 | | 2sin(2x)-4=0 | | 3y-14=22 | | 28+x=5x | | 21-14x-16-10x=x | | 648=a^4b^3 | | 6b^2+25b+14=0 | | 1-1/4=71/2 | | 8r^2+71r-90=0 | | 9k^2+53k+40=0 |