$\left(8ab^2\:c-12af^4\:h\right)\left(8ab^2\:c+12af^4\:h\right)$
$12\cdot5^2$
$52^2-2-7$
$2a^2\left(5b^2+3ab+6a+1\right)$
$-6x+2-4x+38$
$\left(x+5\right)^2=2x^2$
$x^2-4x+2x-6$
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