$12y^2+6y^2+3y^2+10y^2-7y^2+y^2$
$-2x-15\ge90$
$-\left(-15\right)-\left(-6\right)$
$\int\frac{3x+7}{\sqrt{5x-1}}\:dx$
$n^2+3n=10$
$\left(4x^2-xy+y^2\right)dx+\left(x^2-xy+4y^2\right)dy=0$
$\int\left(\frac{x^2+8x+7}{\left(x^2-3x-10\right)^2}\right)dx$
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