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19/10 = x+(2/5)*x+1/2 // - x+(2/5)*x+1/2
19/10-x-((2/5)*x)-(1/2) = 0
(-2/5)*x-x+19/10-1/2 = 0
7/5-7/5*x = 0 // - 7/5
-7/5*x = -7/5 // : -7/5
x = -7/5/(-7/5)
x = 1
x = 1
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