Помогите решить срочно нужно....
1. 2x(2x+3)=3x(3x-8)
2.4x²+20x+21=0
3.(x-3)²=(2x+5)(3-x)
4.x²+0.3x+2x-1 
5. 4x²-7x-11
6. y=3x²+2x-1     y=2x²+3x+5
7.x⁴-25x²+144=0
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