$x\left(a-7\right)+5\left(7-a\right)$
$\int a\cos\left(bx+c\right)dx$
$\left(4d-3b\right)^2$
$-5^2+3-5+-5^2-2-5-5-3-5$
$x^2+7x-6=0$
$tan^2x+4=sec^2x+3$
$13\cdot14$
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