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(4/5)*x+6/5 = (7/3)*x+31/15+2/3 // - (7/3)*x+31/15+2/3
(4/5)*x-((7/3)*x)+6/5-(31/15)-(2/3) = 0
(4/5)*x+(-7/3)*x+6/5-31/15-2/3 = 0
-23/15*x-23/15 = 0 // + 23/15
-23/15*x = 23/15 // : -23/15
x = 23/15/(-23/15)
x = -1
x = -1
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