$7x-18=-2x$
$4^2\cdot22x+121$
$\int_0^{\infty}\left(\frac{1}{1+x^2}-\frac{3}{3x+1}\right)dx$
$6x+3=5x$
$\frac{dy}{dx}=\frac{1}{1+cos\:x}$
$f\left(x\right)=x^{2}-6x^{2}+8x$
$-21\cdot2$
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