$15\left(2x^2-5x+7\right)-8\left(\left(x-2\right)\left(x-4\right)\right)$
$\int x^3\cos\left(3x^4-2\right)dx$
$12xy+5yx-6xy+7yx-xy$
$\left(2a\right)\left(3ab\right)\left(-4a^2b^7\right)$
$4z-2w=0$
$-76\left(-61\right)+\left(-13\right)-\left(-4+\left(-6\right)\right)$
$x^2+6+10$
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