$$3x^{2}+5x^{2}-7x^{2}+10$$
$x^{2}+10$
$$8x^{2}-7x^{2}+10$$
$$x^{2}+10$$
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$2x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(8x^{2}-7x^{2}+10)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(x^{2}+10)$$
$$2x^{2-1}$$
$$2x^{1}$$
$$2x$$
