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84•x+9•{1+2•[3+4•(5•6-7•4)]}=10•(8•x+22)+207

Răspuns :

84x+9*{1+2*[3+4*(30-28)]}= 80x+220+207
84x+9*[1+2*(3+4*2)]=80x+427
84x+9*[1+2*(3+8)]=80x+427
84x+9*(1+2*11)=80x+427
84x+9*(1+22)=80x+427
84x+9*23=80x+427
84x+207=80x+427
84x-80x=427-207
4x=220
x=220/4
x=55