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x in (-oo:+oo)
3*(4/5)-(5*x) = 1/2 // - 1/2
3*(4/5)-(5*x)-(1/2) = 0
3*(4/5)-5*x-1/2 = 0
19/10-5*x = 0 // - 19/10
-5*x = -19/10 // : -5
x = -19/10/(-5)
x = 19/50
x = 19/50
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