$3x^2+18x^2-21x^2-3x^2+3x^2$
$\:\:5x\:^2\:para\:x\::\:1$
$log2\:\left(8\right)$
$-24-\left(+10+-18\right)$
$\frac{1}{3}\log\left(x\right)+4\log\left(x+2\right)$
$195.36-1628\:$
$\frac { 42 y ^ { 9 } y ^ { 2 } } { 7 x ^ { 5 } y ^ { 2 } }$
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