$$(7-5)x[3-2-4 \div 2-3x(6-2-8 \div 4)]=$$
$-2x\left(6x+1\right)$
$$2x\left(3-2-\frac{4}{2}-3x\left(6-2-\frac{8}{4}\right)\right)$$
$$2x\left(1-\frac{4}{2}-3x\left(6-2-\frac{8}{4}\right)\right)$$
$$2x\left(1-2-3x\left(6-2-\frac{8}{4}\right)\right)$$
$$2x\left(-1-3x\left(6-2-\frac{8}{4}\right)\right)$$
$$2x\left(-1-3x\left(4-\frac{8}{4}\right)\right)$$
$$2x\left(-1-3x\left(4-2\right)\right)$$
$$2x\left(-1-3x\times 2\right)$$
$$2x\left(-1-6x\right)$$
$$-2x-12x^{2}$$
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$-12x^{2}-2x$
