$7y+1\le y-5$
$\frac{z}{7}-6\ge-5$
$12a+3a^2+4a^2b^2+15ab-8a^2b^2-9ab-3a^2b+7ab^2$
$\int15x^2e^xdx$
$a\cdot2a+3b-b$
$\frac{\sec^6\left(x\right)-\tan^6\left(x\right)}{\sec^2\left(x\right)\cdot\tan\left(x\right)}$
$36z^2-81y^4$
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