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2-((2/5)*x) = (1/5)*x-4 // - (1/5)*x-4
2-((2/5)*x)-((1/5)*x)+4 = 0
(-2/5)*x+(-1/5)*x+2+4 = 0
6-3/5*x = 0 // - 6
-3/5*x = -6 // : -3/5
x = -6/(-3/5)
x = 10
x = 10
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