$5.25-3$
$1\cdot10^2$
$25a^4b^2-70^2bx^3+49x^6$
$\frac{9^{-2}\cdot9^7}{9^3}$
$-10^2\:-\:\left(-10\right)^2$
$4x^2+8x-45$
$6x-5x\left(x^2-4x\right)-2x-4\left(3x^2-5x+1\right)$
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