a]48751-[10425+y]=3828:12 b][2367-y]-[2 mũ 10-7]=15 mũ 2-20

a)

$48751-(10425+y)=3828÷12$

$48751-(10425+y)=319$

$10425+y=48432$

$y=38007$

b)

$(2367-y)-(2$$\sqrt{10}$$-7)=15$$\sqrt{2}$$-20$

$(2367-y)-(1024-7)=225-20$

$2367-y-1017=205$

$2367-y=1222$

$y=1145$