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3=x+15.5=4x+3
We move all terms to the left:
3-(x+15.5)=0
We get rid of parentheses
-x-15.5+3=0
We add all the numbers together, and all the variables
-1x-12.5=0
We move all terms containing x to the left, all other terms to the right
-x=12.5
x=12.5/-1
x=-12+0.5/1
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