document.write( "Question 256851: The sum of three times a number and 7 more than the number is the same as the difference between -11 and twice the number. What is the number?\r
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document.write( "I have tried:
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document.write( "3x+7=-11-2x
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document.write( "3x+2x=-11-7
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document.write( "x=-18
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document.write( "This is wrong according to my instructor. The answer is actually supposed to be -3. How? \n" );
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Algebra.Com's Answer #188887 by Earlsdon(6294)![]() ![]() ![]() You can put this solution on YOUR website! Try this! \n" ); document.write( "3x+(x+7) \"The sum (+) of three times a number (3x) and seven more than the number (x+7)\" is the same as: \n" ); document.write( "-11-2x \"the difference (-) between -11 and twice the number (2x) \n" ); document.write( "Putting it al together, we get: \n" ); document.write( "3x+x+7 = -11-2x Simplify. \n" ); document.write( "4x+7 = -11-2x Add 2x to both sides. \n" ); document.write( "6x+7 = -11 Subtract 7 from both sides. \n" ); document.write( "6x = -18 Finally, divide both sides by 6. \n" ); document.write( "x = -3 Voila! \n" ); document.write( " |