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(1/5)*x-(9/10) = 20-41 // - 20-41
(1/5)*x-(9/10)-20+41 = 0
(1/5)*x-9/10-20+41 = 0
1/5*x+201/10 = 0 // - 201/10
1/5*x = -201/10 // : 1/5
x = -201/10/1/5
x = -201/2
x = -201/2
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