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100-2×2×8-(35:a+15):4=63

Răspuns :

100-2×2×8-(35:a+15):4=63
100-4×8-(35:a+15):4=63
100-32-(35:a+15 ):4=63
68-(35:a+15):4=63
(35:a+15):4=68-63
(35:a+15):4=5
35:a+15=5×4
35:a+15=20
35:a=20-15
35:a=5
a=35:5
a=7
Sper ca te-am ajutat!