Răspuns :
a+b=90
a-15=b+15=>a=30+b
a=?
b=?
b+b+30=90
2b+30=90
2b=90-30
2b=60
b=60:2
b=30
90-30=60(a)
Răspuns: a=60
b=30
a-15=b+15=>a=30+b
a=?
b=?
b+b+30=90
2b+30=90
2b=90-30
2b=60
b=60:2
b=30
90-30=60(a)
Răspuns: a=60
b=30