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210=5(7n+6)-5n
We move all terms to the left:
210-(5(7n+6)-5n)=0
We calculate terms in parentheses: -(5(7n+6)-5n), so:We get rid of parentheses
5(7n+6)-5n
We add all the numbers together, and all the variables
-5n+5(7n+6)
We multiply parentheses
-5n+35n+30
We add all the numbers together, and all the variables
30n+30
Back to the equation:
-(30n+30)
-30n-30+210=0
We add all the numbers together, and all the variables
-30n+180=0
We move all terms containing n to the left, all other terms to the right
-30n=-180
n=-180/-30
n=+6
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