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3x+15y 3(x+5y
7x+14y =7(x+2y
bc-bd =b(c-d)
3x+15y=3(x+5y)
7x+14y=7(x+2y)
bc-bd=b(c-d)
3x+15y=3(x+5y)
7x+14y=7(x+2y)
bc-bd=b(c-d)