n(x)=7x+4
n(x)= 39
Equal both
n(x)=n(x)
7x+4 =39
Solve for x:
Subtract 4 from both sides of the equation:
7x+4-4 =39-4
7x= 35
Divide both sides by 7:
7x/7= 35/7
x=5
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