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