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You essentially have two equations that you must solve:
x + y = 645
and
x - y = 151
The problem is that you have two variables and therefore it seems impossible to solve, however, the two variables are related to each other. For instance, solving the first equation for y gives you:
y = 645 - x
That is how y relates to x. So, substituting this new value for y in the next equation gives you:
x - (645 - x) = 151
Distribute the negative (remove the parentheses):
x - 645 + x = 151
2x - 645 = 151
2x = 151 + 645
2x = 796
x = 398
Now, plug this new value for x into the first equation:
398 + y = 645
y = 645 - 398
y = 247
Now test:
398 + 247 = 645
398 - 247 = 151
There you have it.
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