$12r\:+8\:+12$
$x^2-60x-720\:=\:0$
$\frac{x^{2}+2x-1}{2x^{3}+3x^{2}-2x}$
$\left(2x+3\right)>2$
$\frac{19}{60}a\:+\frac{1}{3}b\:+\frac{2}{4}b\:-\frac{7}{12}a$
$f\left(x\right)=3\sin\left(x\right)\cos\left(x\right)-\frac{4x}{\tan\left(x\right)}$
$-4-9m+9$
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