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x in (-oo:+oo)
(9/10)*x = -6/1 // + -6/1
(9/10)*x-(-6/1) = 0
(9/10)*x+6 = 0
9/10*x+6 = 0 // - 6
9/10*x = -6 // : 9/10
x = -6/9/10
x = -20/3
x = -20/3
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