Răspunsuri

2014-09-16T21:18:09+03:00
A) 3x+7 = x-2
3x-x = -2-7
2x = -9 / :2
x = - 9/2

b) -2x+5=x-2
-2x-x=-2-5
-3x = -7 / x(-1)
3x = 7 / :3
x = 7/3