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2014-02-09T15:10:06+02:00
X+y=180  x=180-y
x+10/100*x + y-5/100*y=186
x+x/10+y-y/20=186
(x+y)+x/10-y/20=186
180+x/10-y/20=186
x/10-y/20=6
180-y supra 10 -y/20=6 aducem la acelasi numitor
360-2y-y=120
-3y=120-360
-3y=-240
3y=240
y=80  x=100
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