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b.(3x-1)(7+x) = 21x+3x²-7-x = 3x²+20x-7
c.(2a+b)(a-3b)= 2a²-6ab+ab-3b² = 2a²-5ab-3b²
2.(a+b)(x+y+z)= ax+ay+az+bx+by+bz
=(a+b)x+(a+b)y+(a+b)z