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x in (-oo:+oo)
(-8/7)*x = 49.6 // - 49.6
(-8/7)*x-49.6 = 0
-8/7*x-49.6 = 0 // + 49.6
-8/7*x = 49.6 // : -8/7
x = 49.6/(-8/7)
x = -43.40000011
x = -43.40000011
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