$2y\:+\:5\:x\:2y\:+\:6$
$3^7-1$
$5xy-3x+4xy-8x+2xy$
$\log\left(x\right)-\log\left(x+1\right)=2$
$-\frac{1}{5}\cdot0.3$
$\frac{3^{5m}}{3^{3m}}=81^{0.5m}$
$3x-7\ge17$
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