If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3.7+3.7d=42
We move all terms to the left:
3.7+3.7d-(42)=0
We add all the numbers together, and all the variables
3.7d-38.3=0
We move all terms containing d to the left, all other terms to the right
3.7d=38.3
d=38.3/3.7
d=10+1/2.8461538461539
| 3x-10=21-3x | | -5x+100=5x+20 | | 13=8x+1=6x | | 9/5p-12/5=8/5 | | 6y+3=5y+35 | | 2x/4=5x=8/2 | | 7x/3+4/7=12/7 | | 2x+20=6x+6 | | 5x12+3=60+3 | | 8x-77=3x+35 | | 7(2p-10)=150 | | 7(2p+10)=150 | | 12+5x+8-3x=40 | | 2(2x+4)-2=10 | | -5(2x-3)=15-10x | | 5+1+2d=8 | | 3x+5(x+1)=7.1 | | 766=9(20)+9h+20h | | -7/4x=-6 | | x+x+4+2x-4=64 | | 61=0.6x-40 | | 4/11+x=5/11 | | 6h-2-2h+22=40 | | 40x-30x=50 | | 20+3d+d=80 | | 6b-4b+5b=21 | | 2.9=y/3.5 | | 5d+4-3d=20 | | 6(x+1)-(2x+6)=-20 | | 4+2w-2=12 | | 4x+10=5x+20 | | 10x-4=5x-20 |