Question 166330
Its hard to know what you are doing without the full instructions and what "20x+10, 30x -2, 7x+1 " are referring to (are these side lengths? angles?)


However, since I'm seeing a "360" I'm assuming that you are working with angles. 


There's a problem though: ALL angles in a triangle add to 180 degrees (not 360 degrees). So the equation should be:



{{{(20x+10)+(30x -2)+(7x+1)=180}}}



Let me know if you still need help.



Note: the answer is {{{x=3}}} and the three angles are 70, 88, and 22