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• Identical expressions

• -x*exp(x) - exp(x) = zero
• minus x multiply by exponent of (x) minus exponent of (x) equally 0
• minus x multiply by exponent of (x) minus exponent of (x) equally zero
• -xexp(x) - exp(x) = 0
• -xexpx - expx = 0

• Similar expressions

• -x*exp(x) + exp(x) = 0
• x*exp(x) - exp(x) = 0