If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(42-4+1)D=0
We add all the numbers together, and all the variables
39D=0
D=0/39
D=0
| 6x^2=-108x+480 | | -9x+23=68 | | 6-3a=21* | | 7h^2+7h-2=0 | | 5d-2d-d+7=2d | | 5x+5+x=80+x | | (5x+15)+20=90 | | 1/2x-35=14 | | 5(-4x-3)+4x-15=-3(x+2)-4x | | 5(x+5)+x=80+x | | M(x)=4x-32.5 | | 17^2+b^2=56.25^2 | | -2.5x-12=-7 | | 1/9x+9=12 | | -18+9x=18 | | -1.25x+1.25=2.5 | | 230=(x+15)6+20 | | 2x3+1=5x | | 9/2=x1/2 | | 61÷2+15=x | | (61÷2)+15=x | | 8x^2+15=143 | | y-26=64 | | 0.5(-6x12)=9 | | (10+x)-8=-3 | | 5n+2=23 | | 120=2b+2 | | w+25=97 | | -n2-4/2=16 | | (5x+6)=(-8x-2) | | 61-15=x | | 2.6/1.06=x/38.75 |