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x in (-oo:+oo)
1-((9/7)*x) = 7/4 // - 7/4
1-((9/7)*x)-(7/4) = 0
(-9/7)*x-7/4+1 = 0
-9/7*x-3/4 = 0 // + 3/4
-9/7*x = 3/4 // : -9/7
x = 3/4/(-9/7)
x = -7/12
x = -7/12
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