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Solve the following
.

First of all, we can remove the parentheses by multiplying 2 times x and 3:-

Now that we removed the parentheses, the rest is a piece of cake, as long as we pay attention to the signs, and here's what I mean by that.
Subtract x on both sides:-

On simplification, we get

Now we subtract 6 on both sides, which results in

And finally,

[Verification]
We can substitute -10 for x and see whether or not we end up with a true statement.

Perform the operation inside the parentheses first:-

On simplification, we get

Since the left-hand side (L.H.S.) is the same as the right-hand side (R.H.S), our solution (x=-10) is correct.
Good luck.
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