$1500-550+75$
$e^{x+1}y=x$
$16x^2-24x+7$
$\frac{2a^4-9a-7+3a^2}{2a+a^2-1}$
$7x\text{4^2}4fr^4hfhf$
$3\cdot\left(20-\left(-10\right)\cdot2\right)$
$\left(3a^3x+8b^4\right)^2$
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