5x²-8x-4=0
(x+4)²=4x+5
9x(4x-1)=3x-1
0.09-4x²=1.6x
0.1x²-14=-0.4x
(x-4)(4x-3)+3=0
(x+5)²+(x-2)²+(x-7)(x+7)=11x+80

P.S.
На всякий случай, это квадратное уравнение решается через дискриминант
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