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