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9.8=1.4y+4.2
We move all terms to the left:
9.8-(1.4y+4.2)=0
We get rid of parentheses
-1.4y-4.2+9.8=0
We add all the numbers together, and all the variables
-1.4y+5.6=0
We move all terms containing y to the left, all other terms to the right
-1.4y=-5.6
y=-5.6/-1.4
y=+4
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