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x in (-oo:+oo)
5*(-(5*x)-2) = -285 // + 285
5*(-(5*x)-2)+285 = 0
5*(-5*x-2)+285 = 0
5*(-5*x-2)+285 = 0
275-25*x = 0
275-25*x = 0
275-25*x = 0 // - 275
-25*x = -275 // : -25
x = -275/(-25)
x = 11
x = 11
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