Răspuns :
a+b=36
a=4+b
4+b+b=36
4+2xb=36
2xb=36-4
2xb=32
b=32:2
b=16
a=16+4
a=20
a=4+b
4+b+b=36
4+2xb=36
2xb=36-4
2xb=32
b=32:2
b=16
a=16+4
a=20
a + b =36
a= b+4
b+4+b = 36
2 b + 4 = 36
2 b = 36 -4
2 b = 32
b= 32:2
b= 16
a = b+4
a = 16 + 4
a= 20
a= b+4
b+4+b = 36
2 b + 4 = 36
2 b = 36 -4
2 b = 32
b= 32:2
b= 16
a = b+4
a = 16 + 4
a= 20