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x in (-oo:+oo)
-3*x-15 = (1/3)*(2*x-10) // - (1/3)*(2*x-10)
-((1/3)*(2*x-10))-3*x-15 = 0
(-1/3)*(2*x-10)-3*x-15 = 0
-1/3*(2*x-10)-3*x-15 = 0
-1/3*(2*x-10)-3*x-15 = 0
10/3-11/3*x-15 = 0
-11/3*x-35/3 = 0
-11/3*x-35/3 = 0
-11/3*x-35/3 = 0 // + 35/3
-11/3*x = 35/3 // : -11/3
x = 35/3/(-11/3)
x = -35/11
x = -35/11
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