$5y-9z-7y+5z$
$a^3-27b^3$
$\int y\sqrt{2y+4}dy$
$-6a+12b-17a-30b+4a+2b$
$3ab-4bc-5ab+6bc$
$6n-20=3n+7$
$4x^2-32x=28$
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