This blog is undergoing major constructions of characters.

Substitute 10 for 'x' in the equation:  

x² + 3x + 5

2x

⌠ ⌡
∫ 1 2 S ⁵ ₂ S₅¹⁰ ∫ ₅¹⁰ ƒd²x/dt²d²/dt²

$\int \_a\_^b^\{f(x)1+x\}\; dx$

$Fe\_2\_^2+^Cr\_2\_O\_4\_$

⌠²⁰ x

⌡₁₀ 2 + x