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)
(2/3)*x = 21 // - 21
(2/3)*x-21 = 0
2/3*x-21 = 0 // + 21
2/3*x = 21 // : 2/3
x = 21/2/3
x = 63/2
x = 63/2
| 9x+5(0)=-16 | | 9x(11-7)= | | 24a^2=3a | | 2826=3.14*R^2 | | 2x+3(5x-16)=105 | | 650=20m+b | | -3x+7(-3x+14)=166 | | 3n+9-2=-8 | | -2y+14y+3=8y+27 | | 32/5x-5=13 | | 10s^2=810 | | x+x-3+x+4=25 | | 4r^2+24r=64 | | f^2+24f+144=0 | | 7x*9x^2= | | 9=5v+27+4v | | 6/8x=64 | | 4/9N=22 | | 500=25m+b | | 3r-5+2r=-9+5r+7 | | x+3+x+4=25 | | 2+6(7x+5)-6=12 | | -8y-7+5y=29 | | 2+9=711 | | x+2+x+3=19 | | y-3=9/5 | | 2+6(7x+6)=4 | | 4c-7+5=-2+2c | | 9x^2+5=69 | | 12d^2+90d+78=0 | | 13+2j-5=9j+8-7j | | x^2+6x-360=0 |