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49.1-5 = x/2.1 // - x/2.1
49.1-(x/2.1)-5 = 0
49.1-0.47619048*x-5 = 0
44.1-0.47619048*x = 0 // - 44.1
-0.47619048*x = -44.1 // : -0.47619048
x = -44.1/(-0.47619048)
x = 92.60999926
x = 92.60999926
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