[48+50×100÷(28÷a+3×2)-14]×[(50-4×5)+(143×6)]=42316
[48+50×100÷(28÷a+3×2)-14]×[(50-20)+858]=42316
[48+50×100÷(28÷a+3×2)-14]×(30+858)=42316
[48+50×100÷(28÷a+3×2)-14]×888=42316
48+50×100÷(28÷a+3×2)-14=42316/888 - se simplifica fractia
48+5000:(28:a+6)=10579/222+14
5000:(28:a+6)=(10579+14*222)/222-48
5000:(28:a+6)=(13687-48*222)/222
5000:(28:a+6)=3031/222
28:a+6=(5000*222)/3031
28:a=(1110000-6*3031)/3031
a=(3031*28)/1091814
a=42434/545907