$\frac{x}{2}+\frac{5x}{4}=\frac{7x}{4}$
$-84\:+\:+21$
$5a^2\left(x^2-y^2\right)-9b^2\left(x+y\right)\left(x-y\right)$
$-35m^2n^3-70m^3$
$-15+-54$
$\int\:\frac{9x^6+6x^2-4x-4}{2x^4}dx$
$3,25b+2h$
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