If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3r=210
We move all terms to the left:
3r-(210)=0
We move all terms containing r to the left, all other terms to the right
3r=210
r=210/3
r=70
| 16.51+2.56x=21.63 | | -14=`-5+3c | | -4x+4x=-16+19x | | 23.16+36.47x=96.10 | | 2/5-x/2=40 | | -5x+12-7x=-3(5x | | 8.47+4.51x=40.04 | | -4y+4=-6y-8 | | n+4/2+3=13 | | 13.81+39.28x=92.37 | | 9x+210=4x+110 | | 12+3x=99 | | -8=4(y-3)-8y | | -37=5w-8 | | .375+50+x=31=180 | | 2(r+10)=240 | | 1-x+4+17x=-3x | | 7x-10+6x+9=180 | | 4-9x=-16 | | -1=-6+5w | | -10j=-9j-6 | | y=6+1/2 | | 5+3p-p=8=3(p+2) | | (5c)(5)= | | 7+w/2=1 | | 115=3(1+5b)-b | | -7-7h=-8h | | (3x+20)+(3x+20)=180 | | -29=5c+6 | | -7−7h=-8h | | -7+8z=7z | | 4+x-3=96 |