$udx+udy=0$
$3v-36=-42$
$\left(7^3\right).7:7^2$
$\left(k-1\right)\:x^2-5x+3k-7=0$
$x^8-y^4$
$\frac{e^t+e^{4-t}}{e^4+1}$
$12+9\cdot\left(-5\right)$
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