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z in (-oo:+oo)
-7 = (11/177)*z // - (11/177)*z
-((11/177)*z)-7 = 0
(-11/177)*z-7 = 0
-11/177*z-7 = 0 // + 7
-11/177*z = 7 // : -11/177
z = 7/(-11/177)
z = -1239/11
z = -1239/11
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