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x in (-oo:+oo)
-12.4 = x/7-1.2 // - x/7-1.2
1.2-(x/7)-12.4 = 0
-1/7*x-11.2 = 0 // + 11.2
-1/7*x = 11.2 // : -1/7
x = 11.2/(-1/7)
x = -78.40000157
x = -78.40000157
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