document.write( "Question 858385: Given f(x)=x+5 and f(x)=21 find x \n" ); document.write( "
Algebra.Com's Answer #517471 by tommyt3rd(5050)\"\" \"About 
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f(x)=21
\n" ); document.write( "x+5=21
\n" ); document.write( "x=16
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