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(4/5)*x+9/5 = (5/4)*x+43/20+1/4 // - (5/4)*x+43/20+1/4
(4/5)*x-((5/4)*x)+9/5-(43/20)-(1/4) = 0
(4/5)*x+(-5/4)*x+9/5-43/20-1/4 = 0
-9/20*x-3/5 = 0 // + 3/5
-9/20*x = 3/5 // : -9/20
x = 3/5/(-9/20)
x = -4/3
x = -4/3
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