Try and subtract 3x from both sides.
distribute constants and variables on different sides of the equation.
Start with subtracting 2 from both sides and putting the ms together.
Let the number of girls be x.
therefore, number of boys = x+8
Let the first number be x.
Try to form the two equations from the information given and then work them out.
Arrange them in a linear equation and then work out the age.
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