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-4.2y=-8.4
We move all terms to the left:
-4.2y-(-8.4)=0
We add all the numbers together, and all the variables
-4.2y+8.4=0
We move all terms containing y to the left, all other terms to the right
-4.2y=-8.4
y=-8.4/-4.2
y=+2
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