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x in (-oo:+oo)
3/4-6*x = -57/20 // + -57/20
3/4-6*x-(-57/20) = 0
3/4-6*x+57/20 = 0
18/5-6*x = 0 // - 18/5
-6*x = -18/5 // : -6
x = -18/5/(-6)
x = 3/5
x = 3/5
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