ekoponeva 1) = 3,3а + а -4 = 4,3а -4
2) = 5а - 0,7а - 8 = 4,3 - 8
3)  = 5,3b - 2b + 3 = 3,3b + 3
4)  = 9,6b + 7 - 0,4b = 9,2b + 7
5) = 2c - 9 + 5,1c = 7,1c - 9
6) = - 5c + 13 - 6c = 13 - 11c
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1) = 3x - 21 + 5x = 8x -21
2) = 20 - 15x + 8x = 20 - 7x
3) = 2y - 8 + 10y = 12y - 8
4) = 8y + 20 - 11y = 20 - 3y
5) = 4x + x + 6 = 5x + 6
6) = 6x - 3x + 21 = 3x + 21

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Verified answer

1)3,3a+(a-4)=3,3a+a-4=4,3a-4.


2)5a-(0,7a+8)=5a-0,7a-8=4,3a-8.
3)5,3b-(2b+3)=5,3-2b-3=-2b+2,3.
4)9,6b+(7-0,4b)=9,6+7+0,4b=0,4b+16,6.
5) 2c-(9-5,1c)= 2c-9+5,1c=7,1c-9.
6)-5c+(13-6c)=-5c+13-6c=-11c+13.
Задание второе .
1) 3*(х-7)+5х=3х-21+5х=8х-21.
2)5*(4-3х)=20-15х=-15х+20.
3)(у-4)*2+10у=2у-8+10у=12у-8.
4)(2у+5)*4-11у=8у+20-11у=-3у+20.
5)4х+2*(0,5х+3)=4х+х+6=5х+6.
6)6х-3*(х-7)=6х-3х+21=3х+21.