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x in (-oo:+oo)
(1/3)*(2*x+50) = 4*x // - 4*x
(1/3)*(2*x+50)-(4*x) = 0
(1/3)*(2*x+50)-4*x = 0
1/3*(2*x+50)-4*x = 0
1/3*(2*x+50)-4*x = 0
50/3-10/3*x = 0
50/3-10/3*x = 0
50/3-10/3*x = 0 // - 50/3
-10/3*x = -50/3 // : -10/3
x = -50/3/(-10/3)
x = 5
x = 5
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