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help !!!!! 100-{22-3•[12:(75:a+3)+1]}•5= 35. a=?

Răspuns :

[5(13a+25)]/a+25=35
5(13a+25)=35(a+25)
65a+125=35(a+25)
65a+125=35a+875
65a+125-35a-875=0
65a-35a+125-875=0
30a-750=0
30a=750
a=25