The graph of y = f(x) is shown below, with one unit between grid lines. Assume f(x) is defined only on the domain shown. What is the sum of all integers c for which the equation f(x) = c has exactly 6 solutions?
+37146 Look for all of the y lines that cross the graph 6 times
y = -1 -2 -3 all cross the graph 6 times
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