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x in (-oo:+oo)
70 = (x-5)/2 // - (x-5)/2
70-((x-5)/2) = 0
(-1*(x-5))/2+70 = 0
(-1*(x-5))/2+(2*70)/2 = 0
2*70-1*(x-5) = 0
145-x = 0
(145-x)/2 = 0
(145-x)/2 = 0 // * 2
145-x = 0
145-x = 0 // - 145
-x = -145 // * -1
x = 145
x = 145
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