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y in (-oo:+oo)
(8-y)/(-21) = -10 // + 10
(8-y)/(-21)+10 = 0
(8-y)/(-21)+(-21*10)/(-21) = 0
8-y-21*10 = 0
-y-202 = 0
(-y-202)/(-21) = 0
(-y-202)/(-21) = 0 // * -21
-y-202 = 0
-y-202 = 0 // + 202
-y = 202 // * -1
y = -202
y = -202
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