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x+2(x+3) = 12 x+2x+6 = 12 x+2x = 12-6 3x = 6 x = 2 and y = 5
If I have this correct you are asking x^2 + 10^2 = 12^2 Then x=6.633249507108
If the equation is structured like this: (8/x)=(12/(x+2)) then x=4. If the equation is structured like this: (8/x)=(12/x)+2 then x=-2.
3x+12=x+48: 3x-x=-12+48 2x=36 x=18
It is (-1, 3).