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a²+b²/4=9 /*4
a²/4+b²=4 /*4
4a²+b²=36
a²+4b²=16 /*(-4)
4a²+b²=36
-4a²-16b²=-64
----------------
-15b²=-28
b²=28/15
b=√28/√15
b=√420 /15
b=2√105 /15
a²+4*28/15=16
a²+112/15=16 /*15
15a²+112=240
15a²=240-112
15a²=128
a²=128/15
a=√128/√15
a=√1920 /15
a=8√30 /15