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10(9-9n)=270
We move all terms to the left:
10(9-9n)-(270)=0
We add all the numbers together, and all the variables
10(-9n+9)-270=0
We multiply parentheses
-90n+90-270=0
We add all the numbers together, and all the variables
-90n-180=0
We move all terms containing n to the left, all other terms to the right
-90n=180
n=180/-90
n=-2
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