Log(3)(2x+8)-log(3)3x=log(3)12
{2x+8>0⇒2x>-8⇒x>-4
{3x>0⇒x>0
x∈(0;∞)
log(3)[(2x+8)/3x]=log(3)12
(2x+8)/3x=12
2x+8=36x
36x-2x=8
34x=8
x=4/17
21/4n-3/10n=21×4n-3/10n=84n-3/10n=42n-3/8n=21n-3/4n
<span>0.3(8-3Y)=3.2-0.8(y-7)
2.4-0.9у=3.2-0.8у+5.6
0.8у-0.9у=3.2+5.6-2.4
-0.1у=6.4
у=6.4:(-0.1)
у=-64
</span><span>5/6(1/3х-1/5)=3х+3 1/3
5/18x-1/6=3x+3 1/3
5/18x-3x=3 1/3+1/6
-2 13/18x=10/3+1/6
-2 13/18x=20/6+1/6=21/6
x=31/78:(-2 13/18)=31/78*6/21
x=31/273</span>