Răspuns :
a x5+65:10+15=25
ax5+65:10=25-15
=10
ax5+65=10x10
=100
ax5=100-65
ax5=35
a=35:5
a=7
ax5+65:10=25-15
=10
ax5+65=10x10
=100
ax5=100-65
ax5=35
a=35:5
a=7
x-numarul
((5X+65):10)+15=25
(5X +65):10=25-15
(5X +65):10=10
5X +65=10×10
5X +65=100
5X =100-65
5X =35
X =35:5
X=7
((5X+65):10)+15=25
(5X +65):10=25-15
(5X +65):10=10
5X +65=10×10
5X +65=100
5X =100-65
5X =35
X =35:5
X=7