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x in (-oo:+oo)
-31 = -x/4 // + -x/4
-(-x/4)-31 = 0
(1/4)*x-31 = 0
1/4*x-31 = 0 // + 31
1/4*x = 31 // : 1/4
x = 31/1/4
x = 124
x = 124
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