Evaluate
1. 3/7+ -4/5+ -11/7+7/9
2. 2/3+(-4/5)+1/3+3/5
3. 4/7+0+(-8/9)+(-13/7)+17/9
4. 3/8+(-5/12)+3/7+3/12+(-5/8)+(-2/7)
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the answer is 12 beacause it is
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