Question 840396
The angles sum to 180.
If the "=" in "5x=13" should be a "-"
{{{2x+(5x-13)+90=180}}}
{{{7x=103}}}
{{{x=103/7}}}
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If the "=" in "5x=13" should be a "+"
{{{2x+(5x+13)+90=180}}}
{{{7x=77}}}
{{{x=11}}}