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800-40x=310+30x
We move all terms to the left:
800-40x-(310+30x)=0
We add all the numbers together, and all the variables
-40x-(30x+310)+800=0
We get rid of parentheses
-40x-30x-310+800=0
We add all the numbers together, and all the variables
-70x+490=0
We move all terms containing x to the left, all other terms to the right
-70x=-490
x=-490/-70
x=+7
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