$$(4 { x }^{ 4 } y+3 { x }^{ 3 } +3y)+( { 5 }^{ { x }^{ 4 } } y-5 { x }^{ 2 } +4y)$$
$3x^{3}-5x^{2}+4yx^{4}+y\times 5^{x^{4}}+7y$
$x\left(4\ln(5)yx^{2}\times 5^{x^{4}}+16yx^{2}+9x-10\right)$
