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(1/5)*(100-x) = 112 // - 112
(1/5)*(100-x)-112 = 0
1/5*(100-x)-112 = 0
1/5*(100-x)-112 = 0
-1/5*x-92 = 0
-1/5*x-92 = 0
-1/5*x-92 = 0 // + 92
-1/5*x = 92 // : -1/5
x = 92/(-1/5)
x = -460
x = -460
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