Question

Как решить уравнение? 102-(80-(30+x))=72 

Answer 1

102-(80-(30+х))=72
(80-(30+х))=102-72
(80-(30+х))=30
30+х=80-30
30+х=50
х=50-30
х=20

Answer 2

102-(80-(30+x))=72 
-(80-30-x)=72 -102
-(50-x) = -30
50-x = 30
x =50-30 =20
x=20