Răspuns:
a=2
Explicație pas cu pas:
[48+50x100:(28:a+3x2)-14]x[(50-4x5)+ (143-4x6)]=42316
[48+50x100:(28:a+3x2)-14x[(50-20)+(143-24)]=42316
[48+50x100:(28:a+3x2)-14x(30+119)=42316
[48+50x100):(28:a+3x2)-14x]x149=42316
48+50x100:(28:a+3x2)-14=42316:149
48+50x100:(28:a+3x2)-14=284
48+50x100:(28:a+3x2)=284+14
48+50x100:(28:a+3x2)=298
50x100:(28:a+3x2)=298-48
50x100:(28:a+3x2)=250
100:(28:a+3x2)=250:50
100:(28:a+3x2)=5
(28:a+3x2)=100:5
(28:a+3x2)=20
28:a+6=20
28:a=20-6
28:a=14
a=28:14
a=2