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x in (-oo:+oo)
(1/3)*(2*x-40) = 4*x // - 4*x
(1/3)*(2*x-40)-(4*x) = 0
(1/3)*(2*x-40)-4*x = 0
1/3*(2*x-40)-4*x = 0
1/3*(2*x-40)-4*x = 0
-10/3*x-40/3 = 0
-10/3*x-40/3 = 0
-10/3*x-40/3 = 0 // + 40/3
-10/3*x = 40/3 // : -10/3
x = 40/3/(-10/3)
x = -4
x = -4
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