Solving Equations with the Variables on Both Sides

To solve 

 $-2x-5=x+13$  what should you do to move the -2x to the right side?

When moving the variables to the right side of the equation, what operation should be performed?

 $7x+10=8x$  

When moving the variables to the left side of the equation, what operation should be performed?

 $7x+10=8x$  

When moving all the variables to one side of the equation, what variable should be moved to get a positive value of the variable?

 $3x+7=-18+9x$  

When moving all the variables to one side of the equation, what variable should be moved to get a positive value of the variable?

 $3x+7=-18+9x$  

When moving all the variables to one side of the equation, what variable should be moved to get a positive value of the variable?

 $3x+7=-18+9x$