Răspuns:
x=1212
Explicație pas cu pas:
a) 65 - {2x + [(x : 4 + 32): 4 + 58] : 3} : 7 = 48
{2x+[(x:4+32):4+58]:3}:7=133
2x+[(x:4+32):4+58]:3=931
2x+[(x:4+32):4+58]=2793
(x:4+32):4+58=2793-2x
(x:4+32):4=2735-2x
x:4+32=10940-2x
x:4=10908-2x
x=10908-8x
8x+x=10908
9x=10908 => x=1212
