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2. 2py-2pr -yr + = 2p(y-r) - r(y -r) = (2p-r)(y-r)
3. 5py-5yr+ps-rs = 5y(p-r) + s(p-r) = (5y+s)(p-r)
4. 2rs - 2rt + 3sv - 3tv = 2r(s-t)+3v(s-t) = (2r+3v)(s-t)