$\left(7q+8\right)\left(4q-5\right)=0$
$lg\left(\frac{8}{75}\right)-lg\left(\frac{9}{25}\right)+lg\left(\frac{81}{16}\right)$
$-16\cdot8$
$3x^2+x-14$
$20x-5x^2$
$4t-1t+2t$
$tan^2x\left(1+cot^2x\right)=\frac{1}{1-sinx^2}$
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