Question

aflati-l pe x:
1+{2•[3+(x-4)•5]:6}•7=8

Answer 1

1+{2×[3+(x-4)×5]:6}×7=8
{2×[3+(x-4)×5]:6}×7=8-1
{2×[3+(x-4)×5]:6}×7=7
{2×[3+(x-4)×5]:6}=7:7
{2×[3+(x-4)×5]:6}=1
{2×[3+(x-4)×5]}=1×6
{2×[3+(x-4)×5]}=6
[3+(x-4)×5]=6:2
[3+(x-4)×5]=3
[(x-4)×5]=3-3
[(x-4)×5]=0
(x-4)=0:5
(x-4)=0
x=0+4
x=4