$4-2a+3+4a+5-7-3a$
$\int\frac{5}{\left(7+5x\right)^2}dx$
$a^2b^3\cdot a^4b^2$
$2x\left(x+4\right)$
$2\left(3x-2y\right)-2\left(4x+y\right)$
$6\left(9-8n\right)-9\left(1+7n\right)$
$x^2-5x+36$
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