Question

96-(5×5+a×6-40)=5×6+57

Answer 1

96-(5×5+a×6-40)=5×6+57
96-(5×5+a×6-40)=30+57
96-(5×5+a×6-40)=87
96-(25+a×6-40)=87
96-25-a×6+40=87 (am desfacut paranteza si am schimbat semnele)
71-ax6+40=87
71-ax6+40=87
111-ax6=87
111-87=ax6
24=ax6
a=24/6
a=4