document.write( "Question 1109550: What number can you add to and subtract from 129 such that the sum
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Algebra.Com's Answer #724539 by ikleyn(52788) $\"\"$ $\"About$

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document.write( "129 + x = 2*(129-x)\r\n" );
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document.write( "129 + x = 2*129 - 2x\r\n" );
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document.write( "x + 2x = 2*129 - 129  ====>  3x = 129  ====>  x =  = 43.\r\n" );
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