а) 3x+3y = 3*(x+y)
б) 7a+7y = 7*(a+y)
в) 8x+12y = 4*2x+4*3y = 4*(2x+3y)
г) 21a+28y = 7*3a+7*4y = 7*(3a+4y)
а) 3x+3y = 3*(x+y)
б) 7a+7y = 7*(a+y)
в) 8x+12y = 4*2x+4*3y = 4*(2x+3y)
г) 21a+28y = 7*3a+7*4y = 7*(3a+4y)