Question 811954
{{{42 + X = 2*(X + 12)}}}
Multiply the 2 through.
{{{42 + X = 2X + 24}}}
Subtract X from both sides.
{{{42 = X + 24}}}
Subtract 24 from both sides.
{{{highlight(18 = X)}}}
In 18 years Miyuki will be twice as old as her daughter.