Use parenthesis next time. I assume you mean,
(X/- 4) + 3 = 15
drop parenthesis and multiply through by - 4
X - 12 = - 60
X = - 48
----------------check in original equation
- 48/- 4 + 3 = 15
12 + 3 = 15
15 = 15
--------------checks
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If: x/3 + 10 = 15 Then: x = 15
x over 4= 2x+3 over 15
15 plus -3 equals 12 12 divided by -6 equals -2
1/5 plus 1/5 which equals 2/5 or 0.4.
3 over 5 is the same as 9 over 15 so x = 7 over 15.