Question

$8x + 4 = 40$

Answer 1

8x + 4 = 40
8x = 40 - 4
8x = 36
x = 36/8
x = 9/2

Answer 2

Here's your answer !!

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$= > 8x + 4 = 40 \\ = > 8x = 40 - 4 \\ = > 8x = 36 \\ = > x = \frac{36}{8} \\ = > x = 4.5$

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Hope it helps you !! :)