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-0.4n+(0.9-1.2n)=0
We add all the numbers together, and all the variables
-0.4n+(-1.2n+0.9)=0
We get rid of parentheses
-0.4n-1.2n+0.9=0
We add all the numbers together, and all the variables
-1.6n+0.9=0
We move all terms containing n to the left, all other terms to the right
-1.6n=-0.9
n=-0.9/-1.6
n=0.9/1.6
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