$7a^2-7$
$3x-y+5z=12$
$\ln\left(y-1\right)=\ln\left(2x\right)+x$
$\left(-545\right)-\left(-714\right)$
$9x^4-30x^3\:y+25\:x^2\:y^2$
$\left(2\cdot3\right)^2$
$z^2-12z$
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