$\frac{t}{-5}+25=-15$
$211=68-x$
$\lim_{x\to\infty}1xe^{\frac{1}{x}}-1x$
$3x^2-2x+5-x^2+x$
$sin^2x\:-cos^2x\:+\:tan^2x$
$\left(6x^2-7x\right)^2\left(4x-2\right)^3$
$1+sinx=2cos^2x$
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