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0,2*150+0,25y*200=210
150x-200y=900
30+50y=210
150x-200y=900
50y=210-30
150x-200y=900
50y=180 |*4
150x-200y=900
200y=900
150x=900+900
150x=1800 |/150
x=12
150*12-200y=900
x=12
1800-200y=900
x=12
-200y=-1800+900
x=12
-200y=-900 |/(-200)
x=12
y=4,5
x=12