L-ai facut gresit de la inceput!
50grade+2x+20grade+x+90grade+4x-10grade=360grade
50grade+x(2+1+4)+20grade+90grade-10grade=360grade
7x+50grade+100grade=360grade
7x=210grade
x=30grade
Acolo unde ai scris +x te-ai incurcat si ai crezut ca + este 7 datorita scrisului.