document.write( "Question 867: the difference between a number and fifteen is seven. find the number. \n" ); document.write( "
Algebra.Com's Answer #288 by usyim88hk(158)![]() ![]() ![]() You can put this solution on YOUR website! 1) Let the number be x \n" ); document.write( "2) x-15 = 7 or 15-x = 7 (Let's slove the first equation first) \n" ); document.write( "3) x-15+15 = 7+15 (add both sides by fifteen) \n" ); document.write( "4) x = 22 (Check: 22-15=7 , 7=7 [it is right]) \n" ); document.write( "5) 15-x+x = 7+x (Add x to both sides) \n" ); document.write( "6) 15 = 7+x \n" ); document.write( "7) 15-7 = 7+x-7 (subtract 7 from both sides) \n" ); document.write( "8) x = 8 (Check: 15 = 7+8 , 15=15 [it is right]) \n" ); document.write( "9) x = 22 or 8 (FINISH!) \n" ); document.write( " |