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145=-5(5n-4)
We move all terms to the left:
145-(-5(5n-4))=0
We calculate terms in parentheses: -(-5(5n-4)), so:We get rid of parentheses
-5(5n-4)
We multiply parentheses
-25n+20
Back to the equation:
-(-25n+20)
25n-20+145=0
We add all the numbers together, and all the variables
25n+125=0
We move all terms containing n to the left, all other terms to the right
25n=-125
n=-125/25
n=-5
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