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4=10.5x-3.5
We move all terms to the left:
4-(10.5x-3.5)=0
We get rid of parentheses
-10.5x+3.5+4=0
We add all the numbers together, and all the variables
-10.5x+7.5=0
We move all terms containing x to the left, all other terms to the right
-10.5x=-7.5
x=-7.5/-10.5
x=5/7
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