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78=-9n-3(-56+12n)
We move all terms to the left:
78-(-9n-3(-56+12n))=0
We add all the numbers together, and all the variables
-(-9n-3(12n-56))+78=0
We calculate terms in parentheses: -(-9n-3(12n-56)), so:We get rid of parentheses
-9n-3(12n-56)
We multiply parentheses
-9n-36n+168
We add all the numbers together, and all the variables
-45n+168
Back to the equation:
-(-45n+168)
45n-168+78=0
We add all the numbers together, and all the variables
45n-90=0
We move all terms containing n to the left, all other terms to the right
45n=90
n=90/45
n=2
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