!!!!!!!!!!!!!!!!!!!!!!!!!!!
А+5х=б+2х
5х-2х=б-а
3х=б-а
х=(б-а)/3
<span>а) 2(5-y²) (y²+5)+(y²-3)²=2(25-y^4)+(y^4-6y+9)=50-2y^4+y^4-6y+9=-y^4-6y+59
</span><span>б) (a-4)²+(a-4)(a+4)+8a=a^2-8a+16+a^2-16+8a=2a^2</span>
12x+6-5=12x +1 (O_o) bkablabalbamaban