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0+((1+6)÷c+5)÷6=(78-69)÷9

Răspuns :

0+(7÷c+5)÷6=9÷9
0+(7÷c+5) ÷6=1
0+(7÷c+5)=6
7÷c+5=6
7÷c=1
c=7
0+[(1+6):c+5):6=(78-69):9
0+(7:c+5):6=9:9
0+(7:c+5):6=1

0+(7:c+5)=1*6
=6
7:c+5=6-0
=6
7:c=6-5
=1
c=7:1
c=7