Mary -Queen of Scots, French queen- cousin to Elizabeth 1st of England
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Using paragraph details that support each other.
That means you are a christmas tree
2 times x(the unknown number to solve for) minus 1 equals 8+7
2x-1=8+7 8+7=15
2x+1=15 Now we have to get x by itself
In order to do that you add 1 from both sides
2x=16 Then you divide 2 from both sides
x=16/2
x=8