If it's not what You are looking for type in the equation solver your own equation and let us solve it.
42=3r
We move all terms to the left:
42-(3r)=0
We move all terms containing r to the left, all other terms to the right
-3r=-42
r=-42/-3
r=+14
| -7x-15=18 | | 5(4-k)=65 | | -10x-7=-5(6x-7) | | 4(3x+9)=24 | | (3a+1)(4a+8)=0 | | 5(-x+2)=3(7x+2) | | 5=w-38/8 | | 4a+16=13a-(2a+3) | | w/4-11=3 | | 4k2+19k+15=0 | | 4k2+19k=150 | | 3(z-65)=30 | | 24=y/2+10 | | 3x+10+100=180 | | -8(w-4)=-4w+4 | | 70=8k+14 | | 3w+2+1=10-w | | 7x-2+3x+22=180 | | 4w—2=14 | | 20=3s+5 | | 9x-7+x+33=180 | | 2x+5=-3x+50 | | 13=v/4+11 | | k/1.9+89.1=29.2 | | 3v-5=7(v-3) | | 240=-16t^2+64t+80 | | 13x+8=14x+10 | | 13=v/4=11 | | 3f-8=1 | | k/6.4+83.4=15.1 | | 2z-4=23-z | | 4x+2+8x-6=80 |