<PRE><B>Question 49671</B>
7x + 12 = 3x - 4
7x - 3x = -4 -12
4x = -16
x = -16/4
  = -4

6(a - 5) = 4(a + 1)
6a - 30 = 4a + 4
6a - 4a = 4 + 30
2a = 34
a = 34/2
  = 17

4(x + 3) = 12
4x + 12 = 12
4x = 12 - 12
x = -4

n/5 + 10 = 0
n/5 = -10
n = -10*5
  = -50

3x - 7 = 4x + 5
3x - 4x = 5 + 7
-x = 12
x = -12
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