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x in (-oo:+oo)
-58 = -x/7 // + -x/7
-(-x/7)-58 = 0
(1/7)*x-58 = 0
1/7*x-58 = 0 // + 58
1/7*x = 58 // : 1/7
x = 58/1/7
x = 406
x = 406
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