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30-40=-7x+35
We move all terms to the left:
30-40-(-7x+35)=0
We add all the numbers together, and all the variables
-(-7x+35)-10=0
We get rid of parentheses
7x-35-10=0
We add all the numbers together, and all the variables
7x-45=0
We move all terms containing x to the left, all other terms to the right
7x=45
x=45/7
x=6+3/7
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