Răspuns :
notam numarul cu a
[(2a-35)·3]-18=177
[(2a-35)·3]=177+18
[(2a-35)·3]=195
2a-35=195:3
2a-35=65
2a=65+35
2a=100
a=100:2
a=50
[(2a-35)·3]-18=177
[(2a-35)·3]=177+18
[(2a-35)·3]=195
2a-35=195:3
2a-35=65
2a=65+35
2a=100
a=100:2
a=50