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(2+c)(2-c)+((c-3)^-3)(4-2 c)=(2+c)(2-c)+(1/c^3-9c^2+27c-27)*(4-2c)= c^5-9c^4+23c^3+9c^2-106c+104/-c^3+9c^2-27c+27
( 4 - X )( 7 + X ) + ( X + 3 ) = 28 + 4x - 7x - x^2 + X + 3 = 31 - 2x - x^2
X = - 3,5
31 - 2•( - 3,5 ) - ( - 3,5)^2 = 31 + 7 - 12,25 = 38 - 12,25 = 25,75
-1/2х+4=-3 умножим уравнение на 2
-х+8=-6
-х=-14
х=14