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{25+[1550--10×(x--15)÷4}÷5=80
x=?


Răspuns :



25+[1550-10(X-15)]/4=80*5
1550-10(X-15)=(400-25)*4
-10(X-15)= 1500 -1550
10(X-15)=50
10X-150=50
10X=200
X=20