document.write( "Question 831147: Jack is x years old. His brother Dan is 5 years younger. In 3 years time the sum of their ages will be 15. Write an equation in terms of x using the sum of their ages in 3 years time. \n" ); document.write( "
Algebra.Com's Answer #501165 by rm29924(97)\"\" \"About 
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Jack's current age = x
\n" ); document.write( "Dan's current age = x - 5\r
\n" ); document.write( "\n" ); document.write( "Jack's age in 3 years = x + 3
\n" ); document.write( "Dan's age in 3 years = x - 5 + 3\r
\n" ); document.write( "\n" ); document.write( "The sum of their ages in 3 years will be 15.\r
\n" ); document.write( "\n" ); document.write( "The equation for the sum of their ages in 3 years is : x + 3 + x - 5 + 3 = 15\r
\n" ); document.write( "\n" ); document.write( "if you need to solve the equation combine like terms
\n" ); document.write( "2x + 1 = 15
\n" ); document.write( "subtract 1 from both sides
\n" ); document.write( "2x = 14
\n" ); document.write( "divide 2 from both sides to get x by itself
\n" ); document.write( "x = 7\r
\n" ); document.write( "\n" ); document.write( "Jack's age in 3 years = 7 + 3 = 10
\n" ); document.write( "Dan's age in 3 years = 7 - 5 + 3 = 5
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