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2x + 5 - 5 = 2x. You can not solve for x because this is not an equation.
Solve for y: f(-5)=13+2x
2x+a=p 2x=p-a x=.5p-.5a
4-2x-9 = -19 -2x = -19-4+9 -2x = -14 x = 7
2x + 3 is an expression that is already in simplest form; you cannot "solve" it.