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x in (-oo:+oo)
(-x-11)/3 = 21 // - 21
(-x-11)/3-21 = 0
(-x-11)/3+(-21*3)/3 = 0
-x-21*3-11 = 0
-x-74 = 0
(-x-74)/3 = 0
(-x-74)/3 = 0 // * 3
-x-74 = 0
-x-74 = 0 // + 74
-x = 74 // * -1
x = -74
x = -74
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