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