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x in (-oo:+oo)
(20/15)*x-1 = (5/4)*x // - (5/4)*x
(20/15)*x-((5/4)*x)-1 = 0
(20/15)*x+(-5/4)*x-1 = 0
1/12*x-1 = 0 // + 1
1/12*x = 1 // : 1/12
x = 1/1/12
x = 12
x = 12
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