Rewrite all the fractions to have the same denominator:
3/4 = 6/8
-1/4 = -2/8
Now you have -3/8 + 6/8 + -2/8
-3/8 + 6/8 = 3/8
3/8 + -2/8 = 3/8 - 2/8 = 1/8
The answer is 1/8
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