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-x=9 /(-1)
x=-9
3.-7x=10-3
-7x=13 /(-7)
x=-13/7
10x+4_>0
10x_>0-4
10x_>-4/10
x_>0,4
2. (-x-1)=8
-x-1=8
-x=8+1
-x=9/(-1)
x=-9