How do you solve $2sqrt(7x+4)-1=7$ ?

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Answer 1 · 2017-08-19T13:42:10

I got: $x=12/7$

I would rearrange it:
$2sqrt(7x+4)=7+1$
$sqrt(7x+4)=8/2$
$sqrt(7x+4)=4$
square both sides:
$7x+4=16$
$7x=16-4$
$x=12/7$

How do you solve 2sqrt(7x+4)-1=72sqrt(7x+4)-1=7?