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x in (-oo:+oo)
x/5-((3*x)/4) = -x/8 // + -x/8
x/5-((3*x)/4)-(-x/8) = 0
x/5+(-3/4)*x+(1/8)*x = 0
-17/40*x = 0 // : -17/40
x = 0
x = 0
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