Răspuns :
( 88 - a) · 2 = 156
88 · 2 - 2a = 156
176 - 2a = 156
176 -156 = 2a
2a = 20
a = 20/2
a = 10
88 · 2 - 2a = 156
176 - 2a = 156
176 -156 = 2a
2a = 20
a = 20/2
a = 10