$x^2-3x=550$
$-1\:+\:8\::\:\left(-4\right)\:.\:2\:-\:15\::\:\left[2\:.\:\left(-5\right)\:+\:5\right]$
$\left(20b-3\right)^2$
$5.\:4x^2\:-2x\:-6$
$\lim_{x\to1}\left(\frac{\left(x+3\right)\left(x-1\right)}{x^2-1}\right)$
$-5\left(-1-6+1\right)$
$\int4cos7y\:sen3y\:dy$
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