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x in (-oo:+oo)
1-((3/4)*x) = -8 // + 8
1-((3/4)*x)+8 = 0
(-3/4)*x+1+8 = 0
9-3/4*x = 0 // - 9
-3/4*x = -9 // : -3/4
x = -9/(-3/4)
x = 12
x = 12
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