a+b/2=15 /*2a-2/2+ b/4=10 /*4a+b=302a-4+b=40a=30-b2(30-a)+b=4460-2b+b=44a=30-y-b=-16a=30-16b=16a=14b=1614 i 16
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a+b/2=15 /*2
a-2/2+ b/4=10 /*4
a+b=30
2a-4+b=40
a=30-b
2(30-a)+b=44
60-2b+b=44
a=30-y
-b=-16
a=30-16
b=16
a=14
b=16
14 i 16