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x in (-oo:+oo)
-15 = (3/7)*x // - (3/7)*x
-((3/7)*x)-15 = 0
(-3/7)*x-15 = 0
-3/7*x-15 = 0 // + 15
-3/7*x = 15 // : -3/7
x = 15/(-3/7)
x = -35
x = -35
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