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148=120+3.50x
We move all terms to the left:
148-(120+3.50x)=0
We add all the numbers together, and all the variables
-(3.50x+120)+148=0
We get rid of parentheses
-3.50x-120+148=0
We add all the numbers together, and all the variables
-3.5x+28=0
We move all terms containing x to the left, all other terms to the right
-3.5x=-28
x=-28/-3.5
x=+8
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