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r in (-oo:+oo)
15 = (r-412)/28 // - (r-412)/28
15-((r-412)/28) = 0
(-1*(r-412))/28+15 = 0
(-1*(r-412))/28+(15*28)/28 = 0
15*28-1*(r-412) = 0
832-r = 0
(832-r)/28 = 0
(832-r)/28 = 0 // * 28
832-r = 0
832-r = 0 // - 832
-r = -832 // * -1
r = 832
r = 832
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