$x-2=4$
$5x-4y=-1$
$-144b^4+49$
$25\cdot1cm^2$
$10\:cm\:b\:20cm\:\sqrt{300}$
$\left(-xyz+6x^3y+2y^2\right)-\left(10xyz-x^3y+8xyz\right)$
$\left(3t\:+7\right)\:\left(3t\:+\:2\right)\:$
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