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x in (-oo:+oo)
1650 = x+x/0.1 // - x+x/0.1
1650-x-(x/0.1) = 0
1650-x-10*x = 0
1650-11*x = 0 // - 1650
-11*x = -1650 // : -11
x = -1650/(-11)
x = 150
x = 150
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