How can I solve this equation 6+7x=55

You could solve it with these two steps:

#1). Subtract 6 from each side of the equation.

and then

#2). Divide each side by 7.

If you'll do that, the solution will be right there on the paper in front of you.

It'll begin with "x = ", and right after that will be the value of 'x'.

6+7x=55

-6 - 6

7x=49

7x/7 and 49/7

x = 7