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Answer:
x = -7
Step-by-step explanation:
To find the value of x, you need to set up a proportion:
=
Then cross multiply:
15x - 15 = 18x + 36
Then subtract 15x from both sides:
-15 = 3x + 36
Subtract 36 from both sides:
-51 = 3x
Finally, divide both sides by 3:
x = -7