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