If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-3r=39
We move all terms to the left:
-3r-(39)=0
We move all terms containing r to the left, all other terms to the right
-3r=39
r=39/-3
r=-13
| 6.1=9.3-3.2n | | 13n-8n=55 | | x/16=14 | | −3r=39 | | 2(2x-1)(3x-1)=0 | | 4x-3=87 | | 6-a=-2 | | -7t=-49 | | 19=x+76 | | 4(x+4)+40=-4x | | -4r=-80 | | -51=-3x+2(-x-8 | | -86=7k-9 | | 39=−3r | | -33+2x+4x=9 | | -8+9z=1 | | 2/3a*3= | | 1.5x=2.15 | | 3-10m=38-5m | | 100-5x=15 | | 2x+4x-15=33 | | -43=5x-3(2x+16) | | 4/9(x+4)=16 | | 9y-10=161 | | 9y-10=166 | | 12x^2+216x=0 | | -4(v+3)=-12–4v | | -10+x=x+15 | | -65=x-38 | | 5-2c=3c | | 1+8n=13+n | | 2(r=9) |