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a-5=1/5a
a-1/5a=5
-4/5a=5
a=-6i1/4
2)
2-(2+y)=2-(2-x)
2*(-2)-y=2*(-2)+x
-4-y=-4+x
3)
3/x=6
18/x
4)
2x+1≥3
2x≥3-1
2x≥2
x≥1
1/2x < 1
x < 2