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/3 = 7/21 // - 7/21
x/3-(7/21) = 0
x/3-1/3 = 0
1/3*x-1/3 = 0 // + 1/3
1/3*x = 1/3 // : 1/3
x = 1/3/1/3
x = 1
x = 1
| 6*0-2y=8 | | 7*0+2y=6 | | 5y=2y+21 | | 2t^2+15t+65= | | -16t+t= | | 2t^2+17t+65= | | 2t^2+17+65= | | 16t+t= | | 2.10x=y | | 7744777744477x+3=2 | | y=2.10x | | solvex^2+x+.25=7.25 | | 9x-22-20=3x+8 | | 5(r)=4(3.14)r^2 | | -2/3-3=-5 | | 2065=895+308 | | -5x+9y=12 | | 12.5x-10=615 | | 6x+5y=57000 | | 4y+3x=9.25 | | x-75=(0.5)*x | | 5/6/9/14 | | 5x=25/40 | | X(6x+1)(x-9)=0 | | x+3=3x+-3 | | 8x^3+135=10 | | 2x=99999999999 | | 3n-7=-34 | | 6x-7=8x-11 | | x=75+50/100(x) | | x=75+50/100 | | 4(3x+2)=15 |