Compare expressions of each column. Than they are similar? What differ with? Calculate values of expressions and compare them

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39-(5+4)=30 72+6-70=8 8+40-8=40 39-5-4=30 (72+6)-70=8 8+(40-8)=40 (39-5)-4=30 72-70+6=8 8-8+40=40 at first actions in brackets change of the places composed
155
Answer add