$3a-11=4$
$\int2v^3dv$
$25a^2-30ab+9b^2$
$2.44\cdot10^3+1.9\cdot10^5$
$\left(25-11+2\right)+\left(3+5-2-\left(7-2\right)\right)$
$5\cdot x\cdot y;\:x=-1;\:y=2$
$\frac { d y } { d x } = ( - 2 x y )$
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