If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x+140 = 0
x+140 = 0
x+140 = 0
x+140 = 0 // - 140
x = -140
x in (-oo:-140) U (-140:+oo)
(x^2)/(x+140) = 70 // - 70
(x^2)/(x+140)-70 = 0
(x^2)/(x+140)+(-70*(x+140))/(x+140) = 0
x^2-70*(x+140) = 0
x^2-70*x-9800 = 0
x^2-70*x-9800 = 0
x^2-70*x-9800 = 0
DELTA = (-70)^2-(-9800*1*4)
DELTA = 44100
DELTA > 0
x = (44100^(1/2)+70)/(1*2) or x = (70-44100^(1/2))/(1*2)
x = 140 or x = -70
(x+70)*(x-140) = 0
((x+70)*(x-140))/(x+140) = 0
((x+70)*(x-140))/(x+140) = 0 // * x+140
(x+70)*(x-140) = 0
( x+70 )
x+70 = 0 // - 70
x = -70
( x-140 )
x-140 = 0 // + 140
x = 140
x in { -70, 140 }
| d=5/(5+12)X2.5 | | 12x+5+11x+15=180 | | -8(-2-x)-4(x-2)=8 | | n+4.5-5n+2.5= | | 7.4x-6=1.4 | | -3(2s-5)-15=-3(4s+2)-3 | | 70v^2-32v-6=0 | | -2(2x-5)=-38 | | X^4+7x^2+10=0 | | (z/Y)=(a/b) | | T=M(5+FG)forF | | -30(3)(-4)(-3)= | | 3/2x-5/4y=15 | | -13=5+20n-2n | | 10x-21x=22 | | 2x^2+6x^2= | | (x/4)+(x/3)=(9/4) | | 8x+8-5(x+1)=7x+6 | | 8x+3-5x=3-2(x-2) | | 70v^2-62x+12=0 | | 1/5+8/15+2/3 | | 4x^2+x-37=-x^2+x+43 | | 3(-6+7)+4x=-1 | | 1+9x+x=121 | | 5(2+y)=76 | | 217-(123+17)= | | -9-(-5)+(-6)-10= | | 4x^2+8x+4y^2-y=0 | | d=z^2/10 | | 3w-5=-5w+11 | | x+17=68 | | y+6/y+8 |