$100-25m^4$
$\frac{\sec^2\left(x\right)}{sin\left(x\right)}$
$21+9b-4b$
$\:j+j+2kj+j+2k$
$\left(7\cdot\:6\right)^3$
$3x^3+x+3+18-6x^3-8x+3x^3+7x-2x^2$
$4y^2\:-\:x^8$
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