$18\cdot\left(-7\right)\cdot4\cdot\left(-9\right)\cdot10\cdot\left(-3\right)\cdot\left(-5\right)\cdot6$
$3z^2\:y\cdot5z^2\:y+3z^2\:y$
$3y^2+\left(-4y^2\right)-7y+8y^2$
$-5a^{x+1}-3a^{x+1}-5a^{x+1}$
$3x-5\left(2x-1\right)=5x+17$
$\left(5x^3-3x^2\right)^2$
$\left(6f-1\right)^2$
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