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X in (-oo:+oo)
(1/5)*(285-(10*X)) = 55 // - 55
(1/5)*(285-(10*X))-55 = 0
(1/5)*(285-10*X)-55 = 0
1/5*(285-10*X)-55 = 0
1/5*(285-10*X)-55 = 0
2-2*X = 0
2-2*X = 0
2-2*X = 0 // - 2
-2*X = -2 // : -2
X = -2/(-2)
X = 1
X = 1
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