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(fog)(x) = 5(2x-3:3x)-(4*3x:3x)
= (10x-15:3x)-(12x:3x)
= -2x-15:3x
y= -2x-15:3x
3xy=-2x-15
3xy+2x=-15
x(3y+2)=-15
x= -15:(3y+2)
jadi invers dari (fog)(x) adalah -15:(3y+2)