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x in (-oo:+oo)
-7*x-(7*x)-3 = -5 // + 5
5-7*x-(7*x)-3 = 0
5-7*x-7*x-3 = 0
2-14*x = 0 // - 2
-14*x = -2 // : -14
x = -2/(-14)
x = 1/7
x = 1/7
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