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(9/10)*x-(3/5) = (16/25)*x-3 // - (16/25)*x-3
(9/10)*x-((16/25)*x)-(3/5)+3 = 0
(9/10)*x+(-16/25)*x-3/5+3 = 0
13/50*x+12/5 = 0 // - 12/5
13/50*x = -12/5 // : 13/50
x = -12/5/13/50
x = -120/13
x = -120/13
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