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x in (-oo:+oo)
(1/4)*(x-80) = 205 // - 205
(1/4)*(x-80)-205 = 0
1/4*(x-80)-205 = 0
1/4*(x-80)-205 = 0
1/4*x-225 = 0
1/4*x-225 = 0
1/4*x-225 = 0 // + 225
1/4*x = 225 // : 1/4
x = 225/1/4
x = 900
x = 900
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