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Now that you know how to solve statics problems in 2D we will expand those skills for 3D. The same concepts will be applied to solve 3D statics problems but the amount of effort to solve them greatly increases.
For 3D statics problems you will still use the sum of forces and sum of the moments equations, just now it will be forces x, y, and z are equal to zero, and sum of the moments x, y, and z are zero. Now that you have 6 equations you can solve statics problems with 6 unknowns.
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Example (4-30) 
