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x in (-oo:+oo)
x/(-13) = -0.7 // + 0.7
x/(-13)+0.7 = 0
0.7-1/13*x = 0 // - 0.7
-1/13*x = -0.7 // : -1/13
x = -0.7/(-1/13)
x = 9.09999964
x = 9.09999964
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