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In addition to solving equation $ax+b=cx+d$ algebraically, you can also solve it graphically. When the lines $y=ax+b$ and $y=cx+d$ are graphed, you look for the intersection of these lines. In the pictures below are graphed lines $y=ax+b$ and $y=cx+d$. Choose the picture in which the equation $ax+b=cx+d$ has only one non-negative solution.