$18y\:+\:8x\:-\:9y\:+10$
$4x^2-12xy+16y^2$
$\left|-32+5\cdot8-20\right|$
$3-2^2-5-2+2$
$\int\left(\frac{1}{2\sqrt{x}+2x}\right)dx$
$a+3b\:para\:a=-7\:y\:b=2$
$4\:+\:1\:+\:1\:+\:-\:6$
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