$5x^2=125$
$7x^2\left(x^4-3x^3-x^2+2x-5\right)$
$\ln x=42$
$\left(-2x-4\right)-\left(5x+8\right)$
$\left(4^3\right)^3\cdot4^2$
$\left(-x^2-4\right)-\left(x^2+x\right)$
$3x+2y-6z\cdot2x^2y$
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