$2,98-\left(27\right)$
$14x+90=20$
$3-2\left(3x+1\right)$
$225x+12x-31x-8x+5$
$\sec^2x\cdot\cos^2x$
$3x^5+9x^3-2x^2\left(x^2+3\right)$
$\frac{0.16-\left(7a\right)^2}{0.4-7a}$
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