$135+150$
$\left(5xy-9\right)\left(5xy+9\right)$
$x'=\left(7+x\right)\left(9+t\right)$
$x^5.x^{-2^2}.x^{3^0}$
$\ln x^6=12$
$\frac{dx}{dy}=5xy\left(2xy+3y\right)$
$\left(-8f\right)x\left(12\right)$
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