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4y. = 6-20-16
4y. = 30
y. =30/4
10y+20-10y+16=6-4y
10y-10y+20+16=6-4y
20+16=6-4y
36=6-4y
36-6=-4y
30=-4y
4y=-30
y=-30/4
y=-7,5