Помогите решить квадратные уравнения:
2х²-7х++3=0
12х²+16х-3=0
21х²-5х+1=0
х²-3х=0
2х²-72=0
8х²-5х-3=0
16-8а²=0
2а²+3а+1=0
х²+3х-18=0
9х²+12х+4=0
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