1)
[tex]3+2x=21 \ \ /-3\\\\2x=18 \ \ /:2\\\\\huge\boxed{x=9}[/tex]
2)
[tex]5x+4=32 \ \ /-4\\\\5x=28 \ \ /:5\\\\x=\frac{28}{5}\\\\\huge\boxed{x=5\frac{3}{5}}[/tex]
3)
[tex]x-17=19 \ \ /+17\\\\\huge\boxed{x=36}[/tex]
4)
[tex]8x-15=49 \ \ /+15\\\\8x=64 \ \ /:8\\\\\huge\boxed{x=8}[/tex]
5)
[tex]3x-2=6-x\\\\3x+x=6+2\\\\4x=8 \ \ /:4\\\\\huge\boxed{x=2}[/tex]
6)
[tex]3-(x-3)=x-3\\\\3-x+3=x-3\\\\-x-x=-3-3-3\\\\-2x=-9 \ \ /:(-2)\\\\\huge\boxed{x=4,5}[/tex]
7)
[tex]5x-3=8x\\\\5x-8x=3\\\\-3x=3 \ \ /:(-3)\\\\\huge\boxed{x=-1}[/tex]
8)
[tex]-5(2x-7)=4-3(x-5)\\\\-10x+35=4-3x+15\\\\-10x+3x=4+15-35\\\\-7x=-16 \ \ /:(-7)\\\\\huge\boxed{x=2\frac{2}{7}}[/tex]
9)
[tex]\frac{2x-1}{2}-\frac{3x-1}{3}=1+\frac{x-1}{4} \ \ /\cdot12\\\\6(2x-1)-4(3x-1)=12+3(x-1)\\\\12x-6-12x+4=12+3x-3\\\\12x-12x-3x=12-3+6-4\\\\-3x=11 \ \ /:(-3)\\\\\huge\boxed{x=-3\frac{2}{3}}[/tex]
