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Calculeaza: 167-x=178-28 si x-12= 138-38

Răspuns :

167-x=178-28
167-x=150
x=167-150
x=17

x-12=138-38
x-12=130
x=130+12
x=142
167-x= 178-28
167-x= 150
X= 167-150
X= 17

X-12=138-38
X-12=100
X=100+12
X=112