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2014-05-18T09:27:45+03:00
3(X-30/100·x)=5+2x
3x-90/100·x=5+2x
3x-9/10·x=5+2x
x(3-9/10)=5+2x
x(21/10)=5+2x
x-2x=5
-x=5
x=-5