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x in (-oo:+oo)
x/10-4 = 19/20 // - 19/20
x/10-(19/20)-4 = 0
x/10-19/20-4 = 0
1/10*x-99/20 = 0 // + 99/20
1/10*x = 99/20 // : 1/10
x = 99/20/1/10
x = 99/2
x = 99/2
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