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x in (-oo:+oo)
5/7-5*x = -275/7 // + -275/7
5/7-5*x-(-275/7) = 0
5/7-5*x+275/7 = 0
40-5*x = 0 // - 40
-5*x = -40 // : -5
x = -40/(-5)
x = 8
x = 8
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