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x in (-oo:+oo)
12-(x/3) = (-1/3)*(x-36) // - (-1/3)*(x-36)
12-((-1/3)*(x-36))-(x/3) = 0
(1/3)*(x-36)-(x/3)+12 = 0
1/3*(x-36)-x/3+12 = 0
(1/3*3*(x-36))/3-x/3+(3*12)/3 = 0
1/3*3*(x-36)-x+3*12 = 0
36-36 = 0
0 = 0
0/3 = 0
0/3 = 0 // * 3
0 = 0
0 = 0
x należy do R
x in (-oo:+oo)
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