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87.5=3x+50
We move all terms to the left:
87.5-(3x+50)=0
We get rid of parentheses
-3x-50+87.5=0
We add all the numbers together, and all the variables
-3x+37.5=0
We move all terms containing x to the left, all other terms to the right
-3x=-37.5
x=-37.5/-3
x=12+1/2
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