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ce valoare are „x"din operatia (x+139)-4×5=167

Răspuns :

scoatem din paranteza ...
x + 139 - 4 · 5 = 167
x= 167 - 138 + 4· 5
x= 167 - 138 + 20
x = 29 + 20
x = 49
(x+139)-4x5=167
(x+139)-20=167
(x+139)=167+20=187
x=187-139=48
proba
(48+139)-20=187-20=167