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x in (-oo:+oo)
(1/4)*(x-80) = 900 // - 900
(1/4)*(x-80)-900 = 0
1/4*(x-80)-900 = 0
1/4*(x-80)-900 = 0
1/4*x-920 = 0
1/4*x-920 = 0
1/4*x-920 = 0 // + 920
1/4*x = 920 // : 1/4
x = 920/1/4
x = 3680
x = 3680
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