<span>1. -----------
(2a+13)-(7a-2)=10.
2a+13-7a+2-10=0
-5a+5=0
-5a=-5
a=-5:(-5)
a=1
</span><span>---------------
7y-9=5(6y+4)-8
7y-9-30y-20+8=0
-23y-21=0
-23y=21
y=-21/3
2. -------------------
</span><span>12p^3-4= 4(3p^3-1)
-----------------------
3ab^2-a^2b=ab(3b-a)
</span>
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Талшын кытаптын артында бар
{6x-2y-5=2x-3y
{x=5+2y-4y-16