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x in (-oo:+oo)
(-2/5)*x = -7/15 // + -7/15
(-2/5)*x-(-7/15) = 0
(-2/5)*x+7/15 = 0
7/15-2/5*x = 0 // - 7/15
-2/5*x = -7/15 // : -2/5
x = -7/15/(-2/5)
x = 7/6
x = 7/6
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