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2014-10-08T09:50:35+03:00
700 + [ 400 - ( x - 300 ) ] = 850 
400-(x-300)=850-700
400-(x-300)=150
x-300=150+400
x-300=550
x=550+300
x=850
ctinmaria, corecteaza rezolvarea incepand cu al patrulea rand
2014-10-08T10:11:06+03:00
700+[400-(x-300)]=850 
400-(x-300)=850-700
400-(x-30)=150
x-30=400-150
x-30=250
x=250+30
x=280 
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