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x in (-oo:+oo)
(9-x)/4+2 = 10 // - 10
(9-x)/4-10+2 = 0
(9-x)/4+(-10*4)/4+(2*4)/4 = 0
2*4-x-10*4+9 = 0
8-x-31 = 0
-x-23 = 0
(-x-23)/4 = 0
(-x-23)/4 = 0 // * 4
-x-23 = 0
-x-23 = 0 // + 23
-x = 23 // * -1
x = -23
x = -23
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