Плиз срочно очень плиззззз

3) 8х + 3(7-2х)=4х+3;   4) 23-4(3х-8)= 1-17х      2-7у/6 +4у+7/3=у/2;8х+21-6х=4х+3;              23-12х-32=1-17х;        2-7у+8у+14=3у;       -2х=-18;                         -12х+17х=1+32-23;      -2у=-16;х=9.                                5х=10;                          у=8.                                        х=2.        7у-1/12- у +1/4 = 2у+5/3;7у- 1- 3у+3= 8у+20;-4у = 20 - 3+1;-4у=-18;у=-4,5.