If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
a = 20*25*(1/2) // - 20*25*(1/2)
a-(20*25*(1/2)) = 0
a-250 = 0
a-250 = 0 // + 250
a = 250
a = 250
| 29-11x=-6x-96 | | 3c^2-15cd+12d^2=0 | | -20r^2-16r+21=0 | | 6/50=9/x | | 4u^3+3u^2+8u+6=o | | x+x+2x=0 | | 0=12t-5t^2 | | 3c^2+9cd-84d^2=0 | | 8y^3+27x^3= | | 3y^2+9cd-84d^2=0 | | 3*2/3x-3*4 | | 2x^2+5x+50=0 | | r^3-7r-6=0 | | 14x+4-2x-9=x | | 2x*(6x-1)=(3x-2)*(4x+3) | | 6+y+7(y+4)=61-y | | 14x^2+10x+2=0 | | 2x+x-1+3x-13=118 | | 8x+3*(x+1)=5x-(2x-6) | | 8x+3*(x*1)=5x-(2x-6) | | 4x^4-14x^3+36x^2-84x+72=0 | | sin(7x)=x | | 9+y+5(y+1)=63-y | | x+2x+(3x-6)=162 | | 3+5*x=13 | | 11(z+1)-2(z-3)=4(z-4)+4(z-1) | | 3Ix+4I-2=x | | 18=-3(22-m)+3(m-4) | | 6(3x-8)-8=6(x-3)+22 | | 5x=1+6x | | 2x+2x-1+2x-13=118 | | 5x-6x=1 |