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x in (-oo:+oo)
(18/7)*(x-4) = 9 // - 9
(18/7)*(x-4)-9 = 0
18/7*(x-4)-9 = 0
18/7*(x-4)-9 = 0
18/7*x-135/7 = 0
18/7*x-135/7 = 0
18/7*x-135/7 = 0 // + 135/7
18/7*x = 135/7 // : 18/7
x = 135/7/18/7
x = 15/2
x = 15/2
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