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4-(2/5) = (1/5)*x-8 // - (1/5)*x-8
4-((1/5)*x)-(2/5)+8 = 0
(-1/5)*x-2/5+4+8 = 0
58/5-1/5*x = 0 // - 58/5
-1/5*x = -58/5 // : -1/5
x = -58/5/(-1/5)
x = 58
x = 58
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