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x in (-oo:+oo)
1.25 = -x/5 // + -x/5
1.25-(-x/5) = 0
(1/5)*x+1.25 = 0
1/5*x+1.25 = 0 // - 1.25
1/5*x = -1.25 // : 1/5
x = -1.25/1/5
x = -6.25
x = -6.25
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