Помогите с уравнениями:
(х+1/2)(х-1/2) = 5/16
(3х+1,5) (3х-1,5) = 54
3х^2 - 4x / 2 = 5x^2 - x / 3
2x-3x^2 / 5 - 7х^2 - х / 4 = x^2 / 2

Знак / обозначает дробную черту, а ^ квадрат )
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