(2х+3-7)/7=(5х-6-2х)/2(2х-4)/7=(3х-6)/22(2х-4)=7(3х-6)4х-8=21х-4221х-4х=42-817х=34х=2б)(7х-1)/5=(12+3х-7)/2(7х-1)/5=(5+3х)/22(7х-1)=5(5+3х)14х-2=25+15х14х-15х=25+2-х=27х=-27в)=7^15/7^16=1/7г)=5^18×5^3/5^21=1ж)=5×7^14×(3×7-19)/7^15×(7+3)==5×7^14×2/7^15×10==10×7^14/10×7^15=1/7з)=3×19×3^21×(4×3+7)/19^2×3^24==3^22×19×19/19^2×3^24==1/9е)=((65^2-52^2)+(39^2-26^2))/(49-36)^2==((65-52)(65+52)+(39-26)(39+26))/13^2=(13×117+13×65)/13^2==13(117+65)/13^2=182/13=14д)=(93-76)^2/((85^2-68^2)+(51^2-34^2))==17^2/((85-68)(85+68)+(51-34)(51+34))==17^2/(17×153+17×85)==17^2/17(153+85)=17/238==14