$n+4-9-5n$
$1500:\left(-150\right)$
$xz+ylnz=z^2$
$\left(3a\:-\:2b\:+\:7c\right)+\:\left(-4b\:+\:3c\:+2b\right)$
$2y^2+x^2=3$
$x^2-kx+25=0$
$\int_2^5\left(x^2-4x\right)dx$
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