Triangle has angles $x$, $3x$, and $x+15^\circ$. How do I solve for $x$?

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I came across this problem and I understand that I am supposed to find the $x$ first. In order to do that, I believe that an equation is required. How do I solve this?

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HINT: $x+3x+x+15^{\circ}=180^{\circ}$ for each Euclidian triangle