12d^2 + 3dx + x
- (-4d^2 + 2dx - 8x)

dx+9x+16d^2 dont know it it helps any but i tried

Step-by-step explanation:

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540