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x in (-oo:+oo)
(1*x)/7 = -7 // + 7
(1*x)/7+7 = 0
x/7+7 = 0
1/7*x+7 = 0 // - 7
1/7*x = -7 // : 1/7
x = -7/1/7
x = -49
x = -49
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