Tìm x biết
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1) (x+7)2−x(x−3)=12
2) (2x+3)3−4x=10
3) (x+2)2−(x−2)(x+1)=3
4) 27x(x+1)−(3x+1)=−8
5) (2x+3)4−(x−1)2=0
6) (x+1)(x2−x+1)−x(x2−2)=4
7) (x−2)2−(x+1)(x+3)=−7
8) (x+1)2−(x+2)(x−2)=0
9) (2x+3)2−4(x−1)2=16
10) (3x−2)−x(x−5)−3(x−2)2=0
11) (3x−2)(x+9)−(3x−2)2=0
12) x(4x+1)−(2x−3)2=−9