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1/2x=1/8-3/4
1/2x=1/8-6/8
1/2x=-5/8 /:1/2
x=-5/4
3/7-5/8x=1/7
-5/8x=1/7-3/7
-5/8x=-2/7 /:(-5/8)
x=(-2/7)*(-8/5)
x=16/35
x-1/3=0
x=1/3