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x in (-oo:+oo)
-3*x-15 = 2*x-(10/3) // - 2*x-(10/3)
10/3-3*x-(2*x)-15 = 0
10/3-3*x-2*x-15 = 0
-5*x-35/3 = 0 // + 35/3
-5*x = 35/3 // : -5
x = 35/3/(-5)
x = -7/3
x = -7/3
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