Edit: I just noticed you gave an example of what you where trying to solve.. silly me!
Try:
WolframAlpha["y'(t)=2t+5", IncludePods -> {"Differential equation solution"}, PodStates -> {"Step-by-step solution", "Show all steps"}]
What kind of differential equations are you looking to solve?
I'm guessing many differential equations will be solved numerically rather than analytically, but simple ones like this one can give you a step-by-step solution:
WolframAlpha["x'(t)=x(t)", IncludePods -> {"Differential equation solution"},
PodStates -> {"Step-by-step solution", "Show all steps"}]
