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How do I solve it using equations..

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Let x be the number of rows.
Leo plants x+29 trees in each row.   Hence the number of rows is given by
912            x
------  =  
i.e., after simple algebraic manipulations,   912= x^2 +29x or
x^2 +29x - 912= 0 
Solving this second-degree equation, gives two solutions: x=-48, and x =19. We can keep only the positive solution since the number of rows cannot be a negative number.
So the number of rows Leo planted is x=19