$\frac{t}{2}+4<10$
$\frac{12x^2-15x}{4x-5}$
$\left(12+9ab\right)\left(2-7a^2b\right)$
$70x-21xy$
$\left(8x-\frac{1}{8x}\right)\left(8x\:+\:\frac{1}{4x}\right)$
$\frac{-8\left(19a-28\right)}{3\left(3a^2-6a+8\right)}$
$\left(1-seca\right)\left(1+seca\right)$
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