<span>x/3 + x/5=8 x(1/3+1/5)=8 8/15x=8 x=15
</span><span>y/3 + y/4 = 14 y(1/3+1/4)=14 7/12y=14 y=14*12/7=24</span>
<span> -15a-b-2+14a=-a-b-2</span>
7-2х=37-7(х+3)
7-2х=37-7х-21
-2х+7х=37-21-7
5х=9
х=9:5
х=1.8
5-2х=11-7(х+2)
5-2х=11-7х-14
-2х+7х=11-14-5
5х=-8
х=-8:5
х=-1.6