If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
(7/10)*x^2500 = 0
7/10*x^2500 = 0 // : 7/10
x^2500 = 0
x = 0
x = 0
| 4x-y-5/2=0 | | 4x-,y-5/2=0 | | 2sin^2(a)+5cos(a)=2 | | 2sin^2+5cos=2 | | 2sin^2a+5cosa=2 | | 10x-14=x+2 | | 28x-57y=55 | | 0.1(80)+0.2(x)+0.3(33.125)+0.4(50)=50 | | 2+3sinx=0 | | 0.1(80)+0.2(70)+0.3(33.125)+0.4x=50 | | -6x-3y=-21 | | 0.1(80)+0.2(55)+0.3(33.125)+0.4x=50 | | x^4-13x^2+30=0 | | -2x-2x-5x-5x= | | -19y+9z=-65 | | (n*n)*n-90=0 | | 2/3-1/6/25 | | ncubed-90=0 | | nsquared*n-90=0 | | 6x+2y-2= | | 3/11÷11/7 | | 5x^2-2xy+3y^2-12=0 | | x^2-2-90=0 | | 12y^2+19y-18=0 | | 16+52=1*(2x+4) | | (2x-10)*4=40 | | 2*35=3x+4 | | 80x^2-128x-336=0 | | B^2-2b-68=4 | | (2x+8)*2=24 | | 2x^3+6x^2-2x-6=0 | | (32-18)*2x=20+36 |