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x in (-oo:+oo)
4/5-6*x = -27/10 // + -27/10
4/5-6*x-(-27/10) = 0
4/5-6*x+27/10 = 0
7/2-6*x = 0 // - 7/2
-6*x = -7/2 // : -6
x = -7/2/(-6)
x = 7/12
x = 7/12
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