Răspuns:
=(x+16+48)-72+64=60+8
(x+64)-72+64=68
x+64=76
x=12
(x+16+48)-72+64=60+8
(x+64)-72=68-64
(x+64)-72=4
X+64=72+4
X+64=76
X=76-64
X=12