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3/4-((2/5)*x) = 19/20 // - 19/20
3/4-((2/5)*x)-(19/20) = 0
(-2/5)*x+3/4-19/20 = 0
-2/5*x-1/5 = 0 // + 1/5
-2/5*x = 1/5 // : -2/5
x = 1/5/(-2/5)
x = -1/2
x = -1/2
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