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j in (-oo:+oo)
-4*j-(-50/(-7)) = 13 // - 13
-4*j-(-50/(-7))-13 = 0
-4*j-50/7-13 = 0
-4*j-141/7 = 0 // + 141/7
-4*j = 141/7 // : -4
j = 141/7/(-4)
j = -141/28
j = -141/28
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