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x in (-oo:+oo)
x/4-((2*x)/10) = 1 // - 1
x/4-((2*x)/10)-1 = 0
x/4+(-1/5)*x-1 = 0
1/20*x-1 = 0 // + 1
1/20*x = 1 // : 1/20
x = 1/1/20
x = 20
x = 20
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