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2014-08-21T21:11:32+03:00
(5a +42):7-11=200

(5a+42):7=200+11

(5a+42):7=211

5a+42=211*7

5a+42= 1477

5a=1477-42

5a=1435

a=1435:5

a=287
3 3 3
2014-08-21T21:12:48+03:00
X= nr la care te-ai gandit
(x*5+42):7-11=200|+11
(5x+42):7=211|*7
5x+42=1477|-42
5x=1435|:5
x=287
2 1 2