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)
R/3.2 = 2.1/2.4 // - 2.1/2.4
R/3.2-(2.1/2.4) = 0
R/3.2-0.875 = 0
0.3125*R-0.875 = 0 // + 0.875
0.3125*R = 0.875 // : 0.3125
R = 0.875/0.3125
R = 2.8
R = 2.8
| -x/-20=-1/20 | | 17=-13-8c | | 4(-6+3)=-2(-12+6) | | 44-4y=56 | | 11y+7=139 | | x/-5=-6/15 | | 3m=10+5(2-m) | | 4(y+3)=-2(0+6) | | 16-7n=1-6n+7 | | b/6=-12/18 | | 4(5x-5)=10-3(x+1) | | 3*-3-2y=5 | | -x/4=4/8 | | (2/3)^3-2 | | 4(0+3)=-2(-12+6) | | 8(x-3)+14=6(x+4)-3 | | -(t+2)=0 | | -9x+x^2+8=0 | | 44+x-3=2x+1 | | 3(4x+6)=2x-7+10x | | -3/j=-12/8 | | 4(y+3)=-2(-12+6) | | 2(.20+.25x)-2x=x-1 | | 12/60=f/15 | | 3x-24=2x+31 | | 8/15-2/15 | | -225=5(-10x+9) | | 8-8p=-3p | | s/2=-11/22 | | 8x+50=170 | | 4(0+3)=-2(x+6) | | -5x-2y=42 |