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x in (-oo:+oo)
x-(2/3)+1 = x/7 // - x/7
x-(x/7)-(2/3)+1 = 0
x-(x/7)-2/3+1 = 0
6/7*x+1/3 = 0 // - 1/3
6/7*x = -1/3 // : 6/7
x = -1/3/6/7
x = -7/18
x = -7/18
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