Verified answer

Resposta:

[tex]5\left(x-2\right)=4-\left(-2x-1\right)\\5x-10=2x+5\\5x-10+10=2x+5+10\\5x=2x+15\\3x=15\\x=5[/tex]

[tex]3+\left(x-4\right)=3\left(x-4\right)\\3+x-4=3\left(x-4\right)\\x-1=3\left(x-4\right)\\x=3x-11\\-2x=-11\\x=\frac{11}{2}[/tex]

[tex]\frac{1}{2}-2\left(x-2\right)=1-x+1\\\frac{1}{2}-2\left(x-2\right)=-x+2\\-2x+\frac{9}{2}=-x+2\\-2x=-x-\frac{5}{2}\\-x=-\frac{5}{2}\\x=\frac{5}{2}[/tex]