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4x[20+60:(125-7x15)]+x=100
4x[20+60:(125-105)]+x=100
4x[20+60:20]+x=100
4x[20+3]+x=100
4x23+x=100
92+x=100
x=100-92
x=8


Răspuns :

4 x [ 20 + 60 : ( 125 - 105 ) ] + x = 100
4 x ( 20 + 60 : 20 ) + x = 100
4 x ( 20 + 3 ) + x = 100
4 x 23 + x = 100
92 + x = 100
x = 100 - 92
x = 8