$2\cdot x+2=11+x$
$2x+x-13$
$3r+r$
$3+\left(-5\right)^2$
$0,5\left(x+y\right)^3$
$3x^2-9x+x^2-9$
$\int_1^{\infty}\left(2n-1\right)dx$
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