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(1/2)*x+2/5 = (3/5)*x+4/5-(2/3) // - (3/5)*x+4/5-(2/3)
(1/2)*x-((3/5)*x)+2/5-(4/5)+2/3 = 0
(1/2)*x+(-3/5)*x+2/5-4/5+2/3 = 0
4/15-1/10*x = 0 // - 4/15
-1/10*x = -4/15 // : -1/10
x = -4/15/(-1/10)
x = 8/3
x = 8/3
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