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3/4-((3/5)*x) = 9/20 // - 9/20
3/4-((3/5)*x)-(9/20) = 0
(-3/5)*x+3/4-9/20 = 0
3/10-3/5*x = 0 // - 3/10
-3/5*x = -3/10 // : -3/5
x = -3/10/(-3/5)
x = 1/2
x = 1/2
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