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$\int\left(5x+3\right)dx$
Learn how to solve integral calculus problems step by step online. Find the integral of x(x+3)=5x+3. Find the integral. Expand the integral \int\left(5x+3\right)dx into 2 integrals using the sum rule for integrals, to then solve each integral separately. The integral \int5xdx results in: \frac{5}{2}x^2. The integral \int3dx results in: 3x.