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=>3/x=5/20-12/20
=>3/x=-7/20
=>60=-7x
=>x=60/-7
=>x=85,5
=>x=6 4/-7
=>-6 4/7
2)2x/3=3/4-1/2
=>2x/3=3/4-2/4
=>2x/3=1/4
=>8x=3
=>x=8/3
=>x=2 2/3