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2.2 = (x-120)/20 // - (x-120)/20
2.2-((x-120)/20) = 0
(-1*(x-120))/20+2.2 = 0
(-1*(x-120))/20+(2.2*20)/20 = 0
2.2*20-1*(x-120) = 0
164-x = 0
(164-x)/20 = 0
(164-x)/20 = 0 // * 20
164-x = 0
164-x = 0 // - 164
-x = -164 // * -1
x = 164
x = 164
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