$a^2-b^2=36$
$15.25x+150=1431$
$4\cdot0-5\cdot0^2$
$\left(+67\right)\cdot\left(-40\right)$
$\int5\left(5x+4\right)^7dx$
$\frac{\left(x^2-4x+4\right)}{x^2-4}$
$59.637-29.874$
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