How to solve simple pendulum equation and this equation ( $mv' + bv = mg$ )

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I would like to know the steps to solve the simple pendulum (with small angle so it will be linear) and the equation of free falling mass with air resistance which is ( $mv' + bv = mg$ ). I just wanna note that am a beginner in differential equations and wanna ask if there are other methods to solve these 2 equations other than separable and Laplace thanks