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3x+4-5x=-2
3x-5x=-2-4
-2x=-6
x=-6/-2
x=3...
2•
a-2+2a+8=12
3a=12-8+2
3a=6
a=6/3
a=2
3•
3 (m-5)=-18
3m-15=-18
3m=-18+15
m=3/3
m=1
4•
2 (3c-4)=20
6c-8=20
6c=20+8
6c=28
c=28/6
5•
4 (5r-1)+10=-54
20r-4+10=-54
20r=-54-10+4
20r=60
r=3 ...