$$- 4 x ^ { 2 } + 18 x ^ { 2 } + 3 x ^ { 2 } - 5 x ^ { 2 }$$
$12x^{2}$
$$14x^{2}+3x^{2}-5x^{2}$$
$$17x^{2}-5x^{2}$$
$$12x^{2}$$
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$24x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(14x^{2}+3x^{2}-5x^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(17x^{2}-5x^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(12x^{2})$$
$$2\times 12x^{2-1}$$
$$24x^{2-1}$$
$$24x^{1}$$
$$24x$$
