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x in (-oo:+oo)
-7*x-(5/5) = -15 // + 15
15-7*x-(5/5) = 0
15-7*x-1 = 0
14-7*x = 0 // - 14
-7*x = -14 // : -7
x = -14/(-7)
x = 2
x = 2
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