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-0.84y+-3.36=-4.2
We move all terms to the left:
-0.84y+-3.36-(-4.2)=0
We add all the numbers together, and all the variables
-0.84y+0.84=0
We move all terms containing y to the left, all other terms to the right
-0.84y=-0.84
y=-0.84/-0.84
y=1
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