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a)1=x-2/4-3
1=x-2
x=3
b)-1/2=-2-(-1)/2-b
-2+b=-2
b=0
c)-3/4=2-d/9-5
-3=2-d
d=5
d)0=-1/5-a/5-(-4)
0=1-5a/1/9
0=1-5a/9
5a=1
a=1/5