Пожалуйста помогите -_-
1) -15=2x-x^2
2) -15-2x^2=-11x
3) 0,36-x^2=0
4) 16x=-x^2
5) 10x^2+2=x
6 )25x^2+40x+16=0
7) 4b+7=3b^2
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