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1/3x=x+4 /×3
x=3x+4 / -3x
-2x=4 / : (-2)
x=-2
2).1-6/7=4/7
1/7=4/7
3).6(1/4x-2)=18
6/4x-12=18 / +12
1,5x=30 / :1,5
x=20
4).-2(2x-1)=x/3
-4x+2=x/3