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27 = (3/4)*x-9 // - (3/4)*x-9
9-((3/4)*x)+27 = 0
(-3/4)*x+9+27 = 0
36-3/4*x = 0 // - 36
-3/4*x = -36 // : -3/4
x = -36/(-3/4)
x = 48
x = 48
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