$\left(8a^2^{n-1}b-7a^{n+2}b^{7-m}\right)^2$
$\frac{n^4}{9}+2mn+9m^2$
$\left(\frac{4a^{4\:}b^3}{2a^2\:b}\right)^3$
$8y+15x+3y-12x-3x$
$2\left(3-2x\right)=-4-2x$
$-4\left(-7s+5\right)-9s$
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