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