All you need to do is distribute 2 to x and -2. So 2 times x and 2 times -2 is 2x-4, plus the 5x. Now comine the 2x and 5x. 2x+5x is 7x, and all that is left is the -4. So, the end result is 7x-4.
2(x - 2) + 5x
2x - 4 + 5x
7x - 4
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