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x in (-oo:+oo)
-(6*x)-(7*x)-3 = -35/3 // + -35/3
-(6*x)-(7*x)-(-35/3)-3 = 0
35/3-6*x-7*x-3 = 0
26/3-13*x = 0 // - 26/3
-13*x = -26/3 // : -13
x = -26/3/(-13)
x = 2/3
x = 2/3
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