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x in (-oo:+oo)
-51 = x/(-4)-13 // - x/(-4)-13
13-(x/(-4))-51 = 0
1/4*x-38 = 0 // + 38
1/4*x = 38 // : 1/4
x = 38/1/4
x = 152
x = 152
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