1+2−3+4−5+6=7 I have to put one-left and one-right parentheses but I don´t know where
1 + 2 − 3 + 4 − 5 + 6 = 7
1 + 2 − ( 3 + 4 − 5 ) + 6 = 7
1 + 2 − ( 2 ) + 6 = 7
1 + 2 – 2 + 6 = 7
1 + 6 = 7
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