Doubles minus one to solve 8+7
2 times x(the unknown number to solve for) minus 1 equals 8+72x-1=8+7 8+7=152x+1=15 Now we have to get x by itselfIn order to do that you add 1 from both sides2x=16 Then you divide 2 from both sidesx=16/2x=8
I think its probley 16 i dont really understand this question but im sure it is