Решите. 1) 8x(1+2x)-(4x+3)(4x-3)=2x
2) x-3x(1-12x)=11-(5-6x)(5+6x)
3) (6x-1)(6x+1)-4x(9x+2)=-1
4) (x+1)^2+(x-3)^2=2x^2-18
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