hi i''m happy to help.
when you are asked to solve 2x+7=11, what you do is:
add(-7)to the left hand side and the right hand side of the equations to collect like terms
this leaves you with
then to find x, you divide both sides of the equation by 2
working it out, you get:
NOTE: If you want to be sure your answer is correct just substitute 2 for x in the equation 2x+7=11
this means that 2 is the answer.
i hope u understand my explanation