Răspuns :
2x{42-[12+(8+ax5)]} =24
{42-[12+(8+ax5)]} =24÷2
{42-[12+(8+ax5)]} =12
42-[12+(8+ax5)]=12
[12+(8+ax5)] =42-12
12+(8+ax5)=30
(8+ax5) =30-12
8+ax5 =18
ax5 =18-8
ax5 =10
ax5 =105
{42-[12+(8+ax5)]} =24÷2
{42-[12+(8+ax5)]} =12
42-[12+(8+ax5)]=12
[12+(8+ax5)] =42-12
12+(8+ax5)=30
(8+ax5) =30-12
8+ax5 =18
ax5 =18-8
ax5 =10
ax5 =105
2x{42-[12+(8+ax5)]}=24
42-[12+(8+ax5)]=24:2
42-[12+(8+ax5)]=12
12+(8+ax5)=42-12
12+(8+ax5)=30
8+ax5=30-12
8+ax5=18
ax5=18-8
ax5=10
a=10:5
a=2
42-[12+(8+ax5)]=24:2
42-[12+(8+ax5)]=12
12+(8+ax5)=42-12
12+(8+ax5)=30
8+ax5=30-12
8+ax5=18
ax5=18-8
ax5=10
a=10:5
a=2