document.write( "Question 130663: Solve for x:\r
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\n" ); document.write( "\n" ); document.write( "\"4%5Ex%2B5=12\" \n" ); document.write( "
Algebra.Com's Answer #95413 by jim_thompson5910(35256)\"\" \"About 
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\"4%5Ex%2B5=12\" Start with the given equation. \r
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\n" ); document.write( "\n" ); document.write( "\"4%5Ex=7\" Subtract 5 from both sides\r
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\n" ); document.write( "\n" ); document.write( "\"log%2810%2C%284%5Ex%29%29=log%2810%2C%287%29%29\" Take the log of both sides\r
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\n" ); document.write( "\n" ); document.write( "\"x%2Alog%2810%2C%284%29%29=log%2810%2C%287%29%29\" Rewrite the left side using the identity \"log%28b%2C%28x%5Ey%29%29=y%2Alog%28b%2C%28x%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"x=log%2810%2C%287%29%29%2Flog%2810%2C%284%29%29\" Divide both sides by \"log%2810%2C%284%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"x=log%284%2C%287%29%29\" Use the change of base formula to simplify the right side\r
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