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(D+9)=0
We get rid of parentheses
D+9=0
We move all terms containing D to the left, all other terms to the right
D=-9
| 18+m=-8 | | 6+3/4x=9 | | 2h+10=72 | | 3r=140 | | -12=6u+18-19u | | 3r=14 | | -15=5w+5 | | v+8=-7 | | 1/4*2x=100 | | -1.2=5.2+v/4 | | 2(x+1)=7x-18 | | 21=2x-13 | | 2x+4+3x=4(x-3) | | 2−5s=-8−6s | | 23x+1)=x+22 | | -22.6=v/6-34 | | -7x+17/4=1/12 | | 6,4a=7.2 | | 2−-y=6 | | 8-7x=-34 | | |4x|+8=24 | | -9j=4−7j | | 15(15x-7)=3x-9 | | 6=2q-2 | | 2w+6=3w | | 13v-9v=32 | | (4x+5)+(6x+1)= | | -3j+6=-15 | | 36+27=5x | | -4(7-y)=-10y | | 4/5=13/r | | 7/6-(5x-2)=1/5x-12 |