$4x^2\:-\:3x^2$
$49^2-36v^2$
$f\left(x\right)=\left(\frac{x}{1+sin^2\left(x\right)}\right)$
$9a^2b-3xy-15a^2b+8xy-5a^2b+4xy$
$x-2y=9$
$2^3.5^3.7^3$
$7x^2+12=10x^2$
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