Looking at this as an algebra equation, x + 82 = 180, all you need to do is isolate x. To do this, subtract 82 from both sides of the equation to get x = 98.
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a + 3a + 5a = 180 9a =180 a = 20
3x + 2 = 82
100+80, 99+81, 98+82....
a + b + c = 180 b = 3a c = 5a Substituting the values of b and c into the first equation. a + 3a + 5a = 180 or 9a = 180 so that a = 20 then b = 3a = 3*20 = 60 and c = 5a = 5*20 = 100
82 + 82 = 164