SOLUTION: FACTOR BY GROUPING AND EXPLAIN 20ay - 10 ax + 2by-xb

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Question 192757: FACTOR BY GROUPING AND EXPLAIN
20ay - 10 ax + 2by-xb
Answer by Mathtut(3670) About Me  (Show Source):
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20ay-10ax   +  2by-xb
:
10a(2y-x)  + b(2y-x)
:
(2y-x)(10a+b)