Answer:
d= -4
Explanation:
3d- 4 +d = 8d + 12
4d - 4 = 8d + 12
4d = 8d + 16
-4d = 16
Check
-12 - 4 - 4 = -32 + 12
-20 = -20
d = -4
3d – 4 + d = 8d – (-12)
3d - 4 + d = 8d + 12
(4d - 4d) - 4 = (8d - 4d) + 12
-4 = 4d + 12
-4 - 12 = 4d (+ 12 - 12)
-16 = 4d
-16/4 = 4d/4
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