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2014-09-05T13:51:57+03:00
a)302x2-((80-50)x2)6x2+(987-(123x8)x3)x2=604-(30x2)12+(987-(984)x3)x2=604-(60x12)+(987-2952)x2=604-720+(-1965)x2=-116+(-3930)=-4046