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x in (-oo:+oo)
(-2/13)*x = -10.2 // + 10.2
(-2/13)*x+10.2 = 0
10.2-2/13*x = 0 // - 10.2
-2/13*x = -10.2 // : -2/13
x = -10.2/(-2/13)
x = 66.30000166
x = 66.30000166
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