Three tins, $$\(A, B\)$$ and $$\(C\)$$, each contain buttons. Tin $$\(A\)$$ contains $$\(x\)$$ buttons. Tin $$\(B\)$$ contains 4 times the number of buttons that tin $$\(A\)$$ contains. Tin $$\(C\)$$ contains 7 fewer buttons than tin $$\(A\)$$. The total number of buttons in the three tins is 137 Work out the number of buttons in tin $$\(C\)$$.

Answer:

Knowledge points:

Solution: