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(3/5)*x+9/5 = (5/4)*x+51/20+3/4 // - (5/4)*x+51/20+3/4
(3/5)*x-((5/4)*x)+9/5-(51/20)-(3/4) = 0
(3/5)*x+(-5/4)*x+9/5-51/20-3/4 = 0
-13/20*x-3/2 = 0 // + 3/2
-13/20*x = 3/2 // : -13/20
x = 3/2/(-13/20)
x = -30/13
x = -30/13
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