A = 12x+7x = 19x
B = 12a+3b
C=3w+7x-3w=7w
et D = 15yz
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A = 12x+7x = 19x
B = 12a+3b
C=3w+7x-3w=7w
et D = 15yz
A= 12x + 7x
B=12a+3b
C= 3w+7w-3w=7w
D=15yz