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how to factor 21-7t+3r-rt

Sagot :

21- 7t + 3r - rt 
Group: 
(21- 7t) + (3r - rt) 
Factor out the common factors: 
7 (3 - t) + r (3 - t) 
Use the distributive property: 
(3 - t) (7 + r)