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x in (-oo:+oo)
(1/5)*(x-a) = c // - c
(1/5)*(x-a)-c = 0
1/5*(x-a)-c = 0
1/5*(x-a)-c = 0
1/5*x-1/5*a-c = 0
1/5*x-1/5*a-c = 0
1/5*x-1/5*a-c = 0 // + -1/5*a-c
1/5*x = -(-1/5*a-c) // : 1/5
x = (-(-1/5*a-c))/1/5
x = 5*(c-(-1/5*a))
x = 5*(c-(-1/5*a))
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