<span>-x + 1 + 2(x - 1) = -2(-2 - x) + 2
-x + 1 + 2x - 2 = 4 +2x + 2
x - 1 = 2x + 6
x = -7
</span>
8x^2 + 32x = 0
8x(x+4)=0
8x = 0
x+4=0
x=0
x= -4
81a⁵-a=a(3⁴a⁴-1)=a(3²a²-1)(3²a²+1)=a(3a-1)(3a+1)(9a+1)
Y=sinx+tgx
y=sin(x)*sin(3x)
<span>y=2tg(x/2)-3tg(x/3)</span>