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)
(2/7)*x+(3/7)*x-4+8 = 0
5/7*x+4 = 0 // - 4
5/7*x = -4 // : 5/7
x = -4/5/7
x = -28/5
x = -28/5
| 4x-20=44 | | 4y+4y=7y+6 | | p^2-13P-30=0 | | 9x+81=91 | | -13+16=-3(x+7) | | 8x+800-3=837 | | 12x+240=372 | | 4a^2/9b/36a^2b^2 | | x^2-6x^2-16x-6=0 | | -t=17 | | 15+10X=15+9X | | (6a-7a)-(-a+a-a)= | | 1/x^2+4/x^2+4/x=0 | | 12x-48=144 | | 9x+6=19x+8 | | 6-a/4+2 | | -2s+6-a-4= | | s-10=9 | | 5x+40-4=51 | | 1/x^4/x^2+4/x=0 | | 3/7=x/8 | | 2(x-5)=9-3(3x-2) | | (-3x-5y)-(8x+2y)= | | 7(4-3x)+3=-6(z-4)-8 | | y=45x | | 6-18=x | | 550t=200(t+2) | | 3/4x-3+1/2x=3/8x+1/4 | | x=4y-10 | | n/-13-27=-14 | | 3+21=-4(3x-6) | | Y=30x+450 |