3x-7x+5-8+x

3x - 7x + 5 - 8 + x

Combine like terms (3x - 7x + x) and (5 - 8).

-3x - 3 is your answer.

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