(3^)2x +3*3^(2x) = 2^(2x)
4*3^(2x) = 2^(2x) / 3^(2x)
(2/3)^(2x) = 4
2x = log(2/3) (4)
x = (1/2)* [ log(2/3) (4)]
9х+5х=26+30
14х=56
х=56:14
х=4
2)Зх-6х=-7-56
-3х=-63
х=21
3)5х-20=х=8
5х-х=20+8
4х=28
х=7
4)9-7х-21=5-6х
7х+6х=-9+21+5
13х=35
х=2,69
5)(<span>7х+9)-(11х-7)=8
</span>-7х-9-11х+7=8
-7х-11х=9+8
-18х=17
х=-0,94