Answer
$x=4$
Work Step by Step
$4(x+1)=20$
$4x+4=20$
$4x=20-4$
$4x=16$
$\frac{4x}{4}=\frac{16}{4}$
$x=4$
Check the answer.
4(4+1)=20
4(5)=20
20=20
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