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x in (-oo:+oo)
(4/5)*x-6 = -136/25 // + -136/25
(4/5)*x-(-136/25)-6 = 0
(4/5)*x+136/25-6 = 0
4/5*x-14/25 = 0 // + 14/25
4/5*x = 14/25 // : 4/5
x = 14/25/4/5
x = 7/10
x = 7/10
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