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