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)
X/7+x/8 = 0
1/7*X+1/8*x = 0 // - 1/7*X
1/8*x = -(1/7*X) // : 1/8
x = (-(1/7*X))/1/8
x = -8/7*X
x = -8/7*X
| -28+15x=17 | | 3x+8=6x+-25 | | 15y+4=24y-5 | | 4x-6-6x+3= | | 3y^2=-12y | | 2x-9=2x-8 | | 16x+1=9x-6 | | 24=2x1/4+1(2l) | | 2x^2-7x= | | w^2-8w+12/20-5w^2 | | 4t+12-7= | | a/21=58 | | -8x^2=4x | | 24=2w+2l | | 5y^2=25y | | 0.1=-9+k | | 2n-8=3n | | 8=2+2y | | 2/8+9/20m=23/20+7/8m | | 10+x-3(x-2)+12(x-4)=2(x+5)+2x | | 8x+30=4x+110 | | 20x-4=54 | | -5.9(4x+6)-2.2(2x-5)= | | 23.5=x+41 | | d-6.6=-19.9 | | 0=3l^2-25l-28 | | 9v^2-18v-7=0 | | -12x+y=39 | | -3c=6 | | 31.5=x+86 | | 3x+1/4=2x-1/5 | | 4x+20=27-2x |