$$2 { x }^{ 2 } +5 { x }^{ 3 } -3$$
$x\left(15x+4\right)$
$$2\times 2x^{2-1}+3\times 5x^{3-1}$$
$$4x^{2-1}+3\times 5x^{3-1}$$
$$4x^{1}+3\times 5x^{3-1}$$
$$4x^{1}+15x^{3-1}$$
$$4x^{1}+15x^{2}$$
$$4x+15x^{2}$$
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$5x^{3}+2x^{2}-3$
