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x in (-oo:+oo)
9*(x-(1/7)) = 18 // - 18
9*(x-(1/7))-18 = 0
9*(x-1/7)-18 = 0
9*(x-1/7)-18 = 0
9*x-135/7 = 0
9*x-135/7 = 0
9*x-135/7 = 0 // + 135/7
9*x = 135/7 // : 9
x = 135/7/9
x = 15/7
x = 15/7
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