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6-4y+12=22
-4y=4 /:(-4)
y=-1
6-4y+12=22
18-4y=22/-18
-4y=4 / : (-4)
y=-1
6-4(y-3)=22
-4*(y-3)=22-6
-4y+12=16
-4y=16-12
-4y=4
-1y=1
1y=-1