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x in (-oo:+oo)
(1/2)*x+1/3 = 4/5 // - 4/5
(1/2)*x+1/3-(4/5) = 0
(1/2)*x+1/3-4/5 = 0
1/2*x-7/15 = 0 // + 7/15
1/2*x = 7/15 // : 1/2
x = 7/15/1/2
x = 14/15
x = 14/15
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