$9^4\cdot9^{\left(-7\right)}$
$2.5^2+8\left(2.5\right)-10$
$7x+2x-2a+4a+5w-2w+3y$
$\left(7m+9x\right)\left(7m-9x\right)$
$90a\:+\:10a\left(6\:-\:3z\right)$
$15c^3+60c^2d^3$
$\frac{y^4}{121}+\frac{1}{2}+\frac{121}{16y^4}$
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