The marble will roll down the slope and go up on the opposite side to the same height from which it was released.
What happens to the marble when it is released from the left side and the inclinations of the planes on both sides are equal?
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When the marble is released from the left side and the inclinations of the planes on both sides are equal, it will roll down the left plane, gain speed, and then ascend the right plane to the same height from which it was released.