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x in (-oo:+oo)
(1/7)*x = -11.2 // + 11.2
(1/7)*x+11.2 = 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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