135
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54 + -90x
27x2 - 90x + 27 = 9*(3x - 1)*(x - 3)
120 - 90x = 210
First, if you have two equations like, for instance .90x+2000 and .40x+3500 then you would set them equal to each other like this ( .90x+2000=.40x+3500). Then you would solve for x by simplifying the equations as far down as you can.
Half of half of half of one half is one sixteenth (0.0625).