Answer:
The number is -25
Step-by-step explanation:
(-4 +5n)*3 = 7n-212
Distribute
-12 +15n = 7n -212
Subtract 7n from each side
-12 +15n-7n = 7n-7n -212
-12 +8n = -212
Add 12 to each side
-12+12 +8n = -212+12
8n = -200
Divide each side by 8
8n/8 = -200 /8
n =-25
