回答:
説明:
#y =(3x-2)/(4 + x)#
# "両側に4を掛けます" 4 + x#
#rArry(4 + x)= 3x-2#
#rArr4y + xy = 3x-2色(青)「左側に配置」#
#rArrxy-3x = -2-4ylarrcolor(blue) "左側のxで項を集める"#
#rArrx(y-3)= - (2 + 4y)larrcolor(blue) "xを因数分解"#
#rArrx = - (2 + 4y)/(y-3)larrcolor(blue) "で割る"(y-3)#
#rArrx = - (2 + 4y)/ - (3-y)larrcolor(青) "factor out - 1"#
#rArrx =(4y + 2)/(y-3)から(D)#