Question

aflați necunoscuta {111-[408:(a-5)+260]:3}*9+4*8=239

Answer 1

{111-[408:(a-5)+260]:3}x9+4x8=239
{111-[408:(a-5)+260]:3}x9+32=239
{111-[408:(a-5)+260]:3}x9=239-32
{111-[408:(a-5)+260]:3}x9=207
{111-[408:(a-5)+260]:3}=207:9
{111-[408:(a-5)+260]:3}=23
[408:(a-5)+260]:3=111-23
[408:(a-5)+260]:3=88
[408:(a-5)+260]=88x3
[408:(a-5)+260]=264
408:(a-5)=264-260
408:(a-5)=4
a-5=408:4
a-5=102
a=102+5
a=107