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x in (-oo:+oo)
(-7/15)*x = 3 // - 3
(-7/15)*x-3 = 0
-7/15*x-3 = 0 // + 3
-7/15*x = 3 // : -7/15
x = 3/(-7/15)
x = -45/7
x = -45/7
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