$4x-6$
$\left(4x^{2}+3x+6\right)+\left(9x^{2}+3x+10\right)$
$\infty^2-4\infty$
$1\cdot\frac{33}{11}$
$-2-4\left(-3b+7\right)$
$\int_{-1}^1\left(4-4x^2\right)-\left(1-x^2\right)dx$
$\frac{3}{4x^2}+\frac{2}{4x^2}-\frac{3}{4x^2}$
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