1]
[tex]\frac{2}{3}x=-5 \ \ |\cdot\frac{3}{2}\\\\x=-\frac{15}{2}=-7,5[/tex]
2]
[tex]5x-4=6 \ \ |+4\\\\5x=10 \ \ |:5\\\\x=2[/tex]
3]
[tex]2(x+5)=20 \ \ |:2\\\\x+5=10 \ \ |-5\\\\x=5[/tex]
