$\:\:\:y'-\left(2y-7\right)\cdot\left(5x+8\right)=0$
$15xy+30z$
$1-\sin^2\left(7x\right)$
$5\cdot2^{-3}+7\cdot4^{-2}$
$\left(4x^2+y^2-xy\right)dx=\left(3x^2\right)dy$
$6+\left(81+35\right)+2.9-\left(8-7\right)$
$81x^4-18x^2+1$
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