$8.3\cdot1.2$
$2x+y=6$
$3.14\left(4.5^2\right)$
$-\left(23-\left(34-57\right)\right)$
$\frac{6530}{2.9}$
$\frac{4x}{\sqrt{3x-7}}=\frac{16x^2}{3x-7}$
$z\:+\:15\:=\:7$
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