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