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=2.1Y+4.9
We move all terms to the left:
-(2.1Y+4.9)=0
We get rid of parentheses
-2.1Y-4.9=0
We move all terms containing Y to the left, all other terms to the right
-2.1Y=4.9
Y=4.9/-2.1
Y=-2+0.7/2.1
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