$2z+8+3-7z$
$\cos\left(x\right)=-0,25$
$\left(x-27\right).\left(x+10\right)$
$\:2a\:+\:3a\:$
$2x^8\cdot4x^3$
$r\:1.5\left(3x\:+\:4\right)\:+\:0.25\left(6x\:+\:8\right)$
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