3*(x+8,10)-2*(9,8+x)=3x+24.3-19.6-2x=x+4.7 ;
2,5y-(17+y) - 0,5 * (3+y)=2.5y-17-y-0.5=1.5y-17.5 ;
18x+ y - 5y -23x+6y=2y-7x ;
7* (3x+1,2)- 4* ( 9x + 0,3)=21x+8.4-36x-1.2=7.2-15x ;
6,5y-(2, 8+y)- 2,5* (2y-4)=6.5y-2.8-y-5y+10=0.5y+7.2 ;
17x+y-6y-20x+7x=4x-5y