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x in (-oo:+oo)
(-1/7)*x-6 = -37/7 // + -37/7
(-1/7)*x-(-37/7)-6 = 0
(-1/7)*x+37/7-6 = 0
-1/7*x-5/7 = 0 // + 5/7
-1/7*x = 5/7 // : -1/7
x = 5/7/(-1/7)
x = -5
x = -5
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