$-\frac{2\left(6\left(-7+18\right)-\left(9-4\right)-\left(2\right)\right)}{\left(-1^2\right)}$
$4z+8y-2t+5t+8z-6y$
$\int\frac{1}{\left(x^4-2x^3\right)}dx$
$a+b-c-b+2c-a$
$\left(c-5\right)\left(c-4\right)$
$4-+-8$
$cos^2\left(x\right)-sen^2\left(x\right)=cos^2\left(x\right)$
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