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[(72÷a-3×4)×36-19×5]-(124×6-301×2)=195

Răspuns :

[(72:a-3x4)x36-19x5] -(124x6-301x2)=195 

 

[(72:a -12)x36-95]-(744-602)=195

 

[(72:a-12)x36-95]-142=195 

 

(72:a-12)x36-95=195+142 

 

(72:a-12) x36=337+95 

 

(72:a-12)x36=432 

 

72:a-12=432:36 

 

72:a-12=12 

 

72:a=12+12 

 

72:a=24 

 

a=72:24 

a=3