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)
(-10/21)*x+3/7 = 8/21 // - 8/21
(-10/21)*x+3/7-(8/21) = 0
(-10/21)*x+3/7-8/21 = 0
1/21-10/21*x = 0 // - 1/21
-10/21*x = -1/21 // : -10/21
x = -1/21/(-10/21)
x = 1/10
x = 1/10
| 10+A=23 | | 49m^2-n^2=0 | | 2(-x-3)=-36-7x | | 8(c+4)=8(c-2) | | 43=-10n+26 | | 6(x-2)/3=4(x-2)/12 | | 15-a=10 | | -y=85 | | 7x-3x+8=2x-2 | | 48p-5=-5-5 | | 6(x+6)+2=6x+4 | | 4x^2-28x+49/2x-7x=-2 | | (5-5)-x+3=0-x+3 | | mn-7n+4m-28= | | 2/20+4/15=9/15 | | 3/2y-1/4=-3/4y+3/4 | | X^2-16x+320=0 | | -11=-x+7 | | 2m-4+5m=6m-4 | | 4z-16z= | | -10/19x-9/19=8/19 | | 11x-4x+136=11x+48 | | 184=4y-2x | | 1/4/3/4 | | 5-r/5=5r+10/3 | | 3y^2-16y+13=0 | | 1/3(4p-9)=8p+12 | | 5x^3y^4-25xy^2=0 | | 5*x+3=7*x+9 | | (-8y^3/4/y^3z^12)^-1/3 | | 3G+2(-8+3G)=1-g | | 1.8+9=5.7r-6 |