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x in (-oo:+oo)
126/4 = (4*x)/4 // - (4*x)/4
126/4-((4*x)/4) = 0
126/4-x = 0
63/2-x = 0 // - 63/2
-x = -63/2 // * -1
x = 63/2
x = 63/2
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