1) 8y-3(y-3) = 7y - 2( 5y+8)  2) 5(2y - 9) +6y =4(3y-2)-21
3) 5y+7(3-y)=3(5-2y)-6
4) 7y - 4(3y+5)=2-3(4y-9) 
помогите пожалуйста 
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