$${ x }^{ 2 } +2 { x }^{ 2 } -5 { x }^{ 2 }$$
$-2x^{2}$
$$3x^{2}-5x^{2}$$
$$-2x^{2}$$
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$-4x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3x^{2}-5x^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-2x^{2})$$
$$2\left(-2\right)x^{2-1}$$
$$-4x^{2-1}$$
$$-4x^{1}$$
$$-4x$$
