1)5(3-2у)-4(9-y)=3(у+5); 15-10у-36+4у=3у+15;
-6у-3у=15-15+36; -9у=36; у=36:(-9); у=-4; ////
2)14(2х-3)-5(х+4)=2(3х+5)+5х;
28х-42-5х-20=6х+10+5х;
23х-11х=10+62; 12х=72; х=72:12; х=6; //////
3)9(3х-7)+3(8х-11)=3(9х+8);
27х-63+24х-33=27х+24;
51х-27х=96-24;
24х=72; х=72:24; х=3; /////
4)6(7х-11)-13(х-6)=14(2х+1);
42х-66-13х+78=28х+14;
29х-28х=14-12; х=2;