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x in (-oo:+oo)
(5/3)*x+(1/3)*x = 3*x+(7/3)*x+10/3 // - 3*x+(7/3)*x+10/3
(5/3)*x+(1/3)*x-(3*x)-((7/3)*x)-(10/3) = 0
(5/3)*x+(1/3)*x-3*x+(-7/3)*x-10/3 = 0
-10/3*x-10/3 = 0 // + 10/3
-10/3*x = 10/3 // : -10/3
x = 10/3/(-10/3)
x = -1
x = -1
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