Explicație pas cu pas:
[80+(x-50):20]:10-10=0
[80+(x-50):20]:10= 10
80+(x-50):20= 10x10
80+(x-50):20= 100
80+(x-50)= 100x20
80+(x-50)= 2000
x-50 = 2000-80
x -50 = 1920
x = 1920 +50
× = 1970
