$4.5x\:+\:6y\:-3.5x\:+7$
$\:\:9a^2-25b^2$
$\left(1-7x\right)\:\left(3x\:-1\right)$
$3x=9$
$-3x^2+2x-7$
$2\left(y^3+11y^2+75y+126\right)$
$\int_{-2}^42xdx$
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