A cool algebra

Algebra Level pending

There are four unequal, positive integers \(a, b, c \) and \(d\) such that 3\(a+3b+ 5c-d = 0 \). It is also true that \(2a+2b+9c-d = 0\) and \(d\) is between 175 and 200. What is the value of \(a+b-c \)?

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