Ответ:\(3(2x-5)=6x-15\);\(-5(2{,}8x-1{,}2)=-14x+6\);\(0{,}2(7-4x)=1{,}4-0{,}8x\);\(-0{,}6(5+10x)=-3-6x\);\(10(0{,}12x-0{,}8)=1{,}2x-8\);\(\frac23(21x+1{,}5)=14x+1\).