Answer:
63
Explanation:
We need to find the LCD first in order to add the fractions:
7*3 = 21
3*7 = 21
21*1 = 21
So the LCD is 21.
Next, we need to make sure that the fractions have the same denominator in order to add:
-6/7x - 5/21x + 1/3x = -48
-18/21x - 5/21x + 7/21x = -48
-16/21x = -48
Multiply both sides by the reciprocal of -16/21 (21/-16) to get x by itself:
(21/-16)(-16/21)x = -48(21/-16)
x = 63