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x in (-oo:+oo)
(-4/7)*x = 49.23 // - 49.23
(-4/7)*x-49.23 = 0
-4/7*x-49.23 = 0 // + 49.23
-4/7*x = 49.23 // : -4/7
x = 49.23/(-4/7)
x = -86.15250022
x = -86.15250022
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