$\:\left(-a-b\right)^4$
$\:\:\left(\:4x\:-\:3\right)\:\left(\:4x\:+1\:\right)$
$\:\int\left(1-x\right)25dx$
$\frac{15}{7.5}\:\frac{6}{5x+7}$
$3k^2-5k+2$
$x^2+4x+\left(-5x\right)+x^2$
$12x^2-84xy+147y^2$
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