Răspunsuri

2014-05-29T10:45:23+03:00
(a+2)*3 +6=a 3a+6+6=a 3a+12 =a 3a-a = -12 2a=-12 a= -6
2014-05-29T12:47:15+03:00
3(x + 2) + 6 = x
3x + 6 + 6 = x
3x - x = -12
2x = -12
x = -12/2
x = -6
verificare
3(x + 2) + 6 = x
3(-6 + 2) + 6 = -6
3*-6 + 3*2 + 6 = -6
-18 + 6 + 6 = -6
-18 + 12 = -6
-6 = -6