$1.1x+1.2x-5.4=-10$
$x^2-18x+11=0$
$8a\:+9a$
$\int\:\sqrt{1+\left(3x^{\frac{1}{2}}\right)}dx$
$2r+8r=-3+6r+r$
$cot\:a\left(sec\:a-1\right)\left(sec\:a+1\right)$
$\left(a-2\right)\left(2-a\right)$
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