How to solve:
Solve for x:     6x - 10 = 20.
Add 10 to both sides:     6x - 10 + 10 = 20 + 10.
Simplify:     6x = 30.
Divide both sides by 6:     6x/6 = 30/6.
Simplify:     x = 5.
Here's one to try:

      





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