7(x - 2y)² + 3(x - 2y)²
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Step-by-step explanation:
7 (x²+4y²-4xy) + 3(x²+4y²-4xy)
7x²+28y²-28xy+3x²+12y²-12xy
7x²+3x²+28y²+12y²-28xy-12xy
10x²+40y²-40xy
10(x²+4y²-4xy)
hope it helps
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