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56/[9*(7-x/4)-2*4]+18=20

Răspuns :

56/[9*(7-x/4)-2*4]+18=20
56/[9*(7-x/4)-8]=20-18
56/[9*(7-x/4)-8]=2
9*(7-x/4)-8=56:2
9*(7-x/4)-8=28
9*(7-x/4)=28+8
9*(7-x/4)=36
7-x/4=36:9
7-x/4=4
x/4=7-4
x/4=3
x=3×4
x=12