объясните мне как здесь раскрыть скобки и привести подобные слагаемые?
1)-4х-8(9-2х)=
2)1/3(12-2,1y)+0,3y=
3)6(3x-2)+4(5x-1)=
4)-7(3-4c)+14(0,5+2c)=
5)3(2,1x-y)-2,8(2x-3y)=
6)0,4(8t+7)-1,6(2t-3)=
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