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x in (-oo:+oo)
(1/6)*(4*x-100) = 4*x // - 4*x
(1/6)*(4*x-100)-(4*x) = 0
(1/6)*(4*x-100)-4*x = 0
1/6*(4*x-100)-4*x = 0
1/6*(4*x-100)-4*x = 0
-10/3*x-50/3 = 0
-10/3*x-50/3 = 0
-10/3*x-50/3 = 0 // + 50/3
-10/3*x = 50/3 // : -10/3
x = 50/3/(-10/3)
x = -5
x = -5
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