The only "ticky" part is the negative outside of parentheses. Just convert the negative sign into the implied + -1 and then distribute it.
2 - (x + 4) = x - 3
2 + -1(x + 4) = x - 3
2 - x - 4 = x - 3
You should be able to finish it.
2-(x+4)=x-3
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