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x in (-oo:+oo)
(-1/15)*x = -1/30 // + -1/30
(-1/15)*x-(-1/30) = 0
(-1/15)*x+1/30 = 0
1/30-1/15*x = 0 // - 1/30
-1/15*x = -1/30 // : -1/15
x = -1/30/(-1/15)
x = 1/2
x = 1/2
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