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x in (-oo:+oo)
1.3 = (x-120)/10 // - (x-120)/10
1.3-((x-120)/10) = 0
(-1*(x-120))/10+1.3 = 0
(-1*(x-120))/10+(1.3*10)/10 = 0
1.3*10-1*(x-120) = 0
133-x = 0
(133-x)/10 = 0
(133-x)/10 = 0 // * 10
133-x = 0
133-x = 0 // - 133
-x = -133 // * -1
x = 133
x = 133
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