Question

Help me please this question puzzle
1+2+3+4+=1
2+3+4+5+=16
5+6+7+8=109
3+4+5+6=?
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Answer 1

1+2+3+4+(-9)=1

2+3+4+5+2=16

5+6+7+8+83=109

3+4+5+6=18