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x in (-oo:+oo)
(2*(6-x))/4 = 20 // - 20
(2*(6-x))/4-20 = 0
(2*(6-x))/4+(-20*4)/4 = 0
2*(6-x)-20*4 = 0
-2*x-68 = 0
(-2*x-68)/4 = 0
(-2*x-68)/4 = 0 // * 4
-2*x-68 = 0
-2*x-68 = 0 // + 68
-2*x = 68 // : -2
x = 68/(-2)
x = -34
x = -34
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