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x in (-oo:+oo)
3 = x/2.1 // - x/2.1
3-(x/2.1) = 0
3-0.47619048*x = 0
3-0.47619048*x = 0 // - 3
-0.47619048*x = -3 // : -0.47619048
x = -3/(-0.47619048)
x = 6.29999995
x = 6.29999995
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