If it's not what You are looking for type in the equation solver your own equation and let us solve it.
r in (-oo:+oo)
-21/4 = r-(5/6) // - r-(5/6)
5/6-r-21/4 = 0
-r-53/12 = 0 // + 53/12
-r = 53/12 // * -1
r = -53/12
r = -53/12
| -12+b=-28 | | exp(2z)=1-i | | y=4sin^2(3x) | | -55=-1+3n | | 12x-2x=9x | | W-p=4+f | | 1/2(3G-3)=g/2 | | Y+5=-5(x-2) | | 2x+4(3x+6)=3 | | 5-(x+3)=-1+2(r-3) | | 21+4f=7f | | -12=x-(-6) | | 7d+-3=3d | | 10cos^2x-6=0 | | 18-a=17 | | -4p-7=-83 | | rx+t=s-t | | -v-8v+7=-47 | | -2(5x+10)+5x=-30 | | 6-17=23 | | 1204=14(15x-19) | | 90+5x+(4x+6)+(4x+6)+113=540 | | 2x^3+5=3x^2-2x | | 2/8x-5=7 | | 5*n+9=3*n+17 | | 223.2+6x=45 | | -18-wet=26 | | 10x=7y-18 | | y-5=1/5(x-5) | | 9(11+4)-8= | | 5y-4y+y-15= | | 9+3x=-36 |