$10k+1+8k+2$
$8x^226x+20$
$4x^2+9y^2\:=100$
$d^4-2d^2g^3+g^6$
$\frac{3}{2+4x}$
$-2\cdot\left(3-5\right)+4\cdot\left(-1+3\right)+10$
$x^2y'+x^2y=x^2sin\left(e^x\right)$
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