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)
(-1/3)*x+(16/21)*x = 9/21 // - 9/21
(-1/3)*x+(16/21)*x-(9/21) = 0
(-1/3)*x+(16/21)*x-3/7 = 0
3/7*x-3/7 = 0 // + 3/7
3/7*x = 3/7 // : 3/7
x = 3/7/3/7
x = 1
x = 1
| 64x^2+80x+34=0 | | -4/3x+30/6x=11/6 | | 64x^2+80x+25=-9 | | (60/x)-(60/x-6)=(8/x) | | 8=-3/4+b | | 6q+1=3q-8 | | (3/x)+(1/x)=4 | | x+(3/x)=-4 | | 9x+22=5x+10+2(x+9) | | 3/8y=30/16 | | -3(8.3+3)=16 | | 5(x+16)-33x=7 | | x^4-9x^2+8= | | -15t^2-24t-9=0 | | 3/8y=114/16 | | ((5a+7)/(a+2))-((3a-4)/(a+2)) | | 2x^2-3x+3= | | x^2+2xy=27 | | (-1/5)(-1/5)(-1/5)(-1/5)(-1/5) | | 12=x-5 | | 4x^2-21-18=0 | | -2(2s-1)-2=-3(7s+3)-4 | | (3-2b)(3+2b)= | | x^4-21x-18= | | 3+11x=36 | | 7X+10-9X=14-16X+14X-4 | | 7x^2+5x/x^2+1-5x/x^2-6 | | v(v-2)=35 | | 10y+15=85 | | -8/3+-4= | | R+r=42 | | -8=(b-6)4 |