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x in (-oo:+oo)
(-7/9)*(x-15.6) = -9 // + 9
(-7/9)*(x-15.6)+9 = 0
9-7/9*(x-15.6) = 0
9-7/9*(x-15.6) = 0
21.133333368-7/9*x = 0
21.133333368-7/9*x = 0
21.133333368-7/9*x = 0 // - 21.133333368
-7/9*x = -21.133333368 // : -7/9
x = -21.133333368/(-7/9)
x = 27.17142854
x = 27.17142854
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