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x in (-oo:+oo)
-x/7 = -5.1 // + 5.1
5.1-x/7 = 0
5.1-1/7*x = 0 // - 5.1
-1/7*x = -5.1 // : -1/7
x = -5.1/(-1/7)
x = 35.70000071
x = 35.70000071
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