If it's not what You are looking for type in the equation solver your own equation and let us solve it.
r=721
We move all terms to the left:
r-(721)=0
We move all terms containing r to the left, all other terms to the right
r=721
| -3.8g+5+2.7g=12.7g | | -0.5=p/10 | | 3x+9-8x6=62/3 | | 5x10=5x-19 | | 4x10=4x+10 | | 10/3=10/o | | 5n-5=7n+21 | | 3/10=10/p | | 8−8f=-9f | | 50/10=10/p | | (D^4-2D^3-6D^2-18D-135)y=0 | | T=8.5d | | -4−h=6−2h | | 2(x+6)-12=18 | | x+18=9x+6=2x+23=7x-2 | | 6s=60*4 | | 10/50=10/p | | 10/50=10p | | 4(5x−4)+x−1= 88 | | 2q+10=-10−8q | | 2(24+2x)=x+48 | | 3/6=n/7 | | 3(8-2)-5x=9 | | -8u=5−9u | | 71-y=266 | | −6.4=x+4.3 | | 8(7—y)=—24 | | x/8=31/2 | | -4+5m=6+6m | | 2(5n+3)=8n+2(n=3) | | -4(x+3)-3x=2x+6 | | 6x+7+5x+2+12x-4=180 |