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(4/5)*x+9/5 = (8/3)*x+31/15+2/3 // - (8/3)*x+31/15+2/3
(4/5)*x-((8/3)*x)+9/5-(31/15)-(2/3) = 0
(4/5)*x+(-8/3)*x+9/5-31/15-2/3 = 0
-28/15*x-14/15 = 0 // + 14/15
-28/15*x = 14/15 // : -28/15
x = 14/15/(-28/15)
x = -1/2
x = -1/2
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