First, let's subtract three from both sides so that x is isolated:
5x + 3 - 3 = 4 - 3
5x = 1
Divide both sides by 5 so that x is now completely isolated:
x =
This can also be written as 0.2, in case the question prompted for decimal form.
Good luck!
5x + 3 = 4
= 5x = 1
= x => 1/5
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