48−3[5+8{4−4(9−2)+6}−12]÷3 First, solve the innermost bracket (9-2): ⇒48−3[5+8{4−4×7+6}−12]÷3 Next, solve the multiplication inside the curly braces } : ⇒48−3[5+8{4−28+6}−12]÷3 Now, solve the addition and subtraction inside the curly braces \{ \} from left to right: ⇒48−3[5+8{−24+6}−12]÷3 ⇒48−3[5+8{−18}−12]÷3 Then, solve the multiplication inside the square bracket [ ]: ⇒48−3[5+(−144)−12]÷3 ⇒48−3[5−144−12]÷3 ⇒48−3[−139−12]÷3 ⇒48−3[−151]÷3 ⇒48−(−453)÷3 ⇒48−(−151) ⇒48+151 ⇒199