Answer
$x=\dfrac{1}{3}$
Work Step by Step
Add $2x$ to both sides to obtain:
$7x+1+2x=4-2x+2x
\\9x+1=4$
Subtract $1$ to both sides to obtain:
$9x=3$
Divide $3$ to both sides to obtain:
$x =\frac{3}{9}
\\x=\dfrac{1}{3}$
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