Răspunsuri

2014-06-01T14:36:11+03:00
15-7(3-6x)=9(5x-2)
15-21+42x=45x-18
-6+42x=45x-18
45x-42x=18-6
3x=12
x=4
2014-06-01T14:40:41+03:00
A)  ???

b) 15 - 7(3 - 6x) = 9(5x - 2)         
Desfacem parantezele:
15 - 21 + 42x = 45x - 18
18 + 15 - 21 = 45x - 42x
33 - 21 - 3x
12 = 3x 
3x = 12
x = 12 / 3
x = 4