-(x - one * two)^ two *exp(-x) + (two *x - four)*exp(-x) = zero
minus (x minus 1 multiply by 2) squared multiply by exponent of ( minus x) plus (2 multiply by x minus 4) multiply by exponent of ( minus x) equally 0
minus (x minus one multiply by two) to the power of two multiply by exponent of ( minus x) plus (two multiply by x minus four) multiply by exponent of ( minus x) equally zero
-(x - 1*2)2*exp(-x) + (2*x - 4)*exp(-x) = 0
-x - 1*22*exp-x + 2*x - 4*exp-x = 0
-(x - 1*2)²*exp(-x) + (2*x - 4)*exp(-x) = 0
-(x - 1*2) to the power of 2*exp(-x) + (2*x - 4)*exp(-x) = 0