The way to solve an equation for x is quite simple.
Say you have an equation of 3x + 5 = 20.
First step: Isolate x. You do that by subtracting 5 from both sides and you get the equation 3x = 15.
Second step: Solve for x. You have an equation now 3x = 15. You must divide by 3 from both sides which leaves x = 5.
Here is another equation that is a little trickier.
x/7 + 4 = 10.
First step: Subtract 4 from both sides. This looks like a mess, but once you get the 4 out of there it becomes easier. You are left with an equation of x/7 = 6.
Second step: Multiply both sides by 7. You want x by itself so you must get the 7 out of the denominator. The solution is x = 42.
This is one that is not so fun.
5/x +3 = 8
First step: Subtract 3 from both sides. It is always easier to find x when you get the extra numbers out of the way. You are left with an equation 5/x = 5.
Second step: Multiply both sides by x. Since x is in the denominator and you must solve for x, you have to put x in the numerator. You will get 5 = 5x.
Third step: Divide by 5. The result is x = 1.
The last equation shown is a little tougher than the previous two but as long as you follow the steps, you will be just fine. Good luck!