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x in (-oo:+oo)
1-((9/7)*x) = 5/2 // - 5/2
1-((9/7)*x)-(5/2) = 0
(-9/7)*x-5/2+1 = 0
-9/7*x-3/2 = 0 // + 3/2
-9/7*x = 3/2 // : -9/7
x = 3/2/(-9/7)
x = -7/6
x = -7/6
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