aflati y:
y+4=3x[-(-12-x)
y+3+y+10+y+7=y


Răspuns :

y+3+y+10+y+7=y
3Y-Y=-20
2×Y=-20
Y= -10

y+4=3x[-(-12-x)
Y+4 = 3×(12+X)
Y+4= 36+3X
-10+4 = 36+3X
-6=36+3X
3X= -6-36
3X = -42
X= -42:3
X = -14