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79+[504-(36+36:x)× 7]÷10=100

Răspuns :

79+[504-(36+36:x)×7]÷10=100/-79
[504-(36+36:x)×7]÷10=21/×10
504-(36+36:x)×7=210
504-210=(36+36:x)×7
294=(36+36:x)×7/:7
42=36+36:x/-36
6=36:x
x=36:6
x=6