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9/20 = (3*x)/5-((3*x)/8) // - (3*x)/5-((3*x)/8)
(3*x)/8-((3*x)/5)+9/20 = 0
(-3/5)*x+(3*x)/8+9/20 = 0
9/20-9/40*x = 0 // - 9/20
-9/40*x = -9/20 // : -9/40
x = -9/20/(-9/40)
x = 2
x = 2
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