12x + 5 - 2x =
(12x - 2x) + 5 =
10x + 5 =
5 (2x + 1)
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There is no equation nor inequality on the question. All it consists of is an expression: an expression cannot be solved.
30+12x = 6(5+2x)
There is no rational factorisation to this expression.
Since that isn't an equation, there is really nothing to solve.
The expression (12x + 36)/48x can be simplified by factoring out 12/12 from the expressions. This leaves (x + 3)/4x.