42+2n-4=180

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Solution for 42+2n-4=180 equation: 



42+2n-4=180

We move all terms to the left:

42+2n-4-(180)=0

We add all the numbers together, and all the variables

2n-142=0

We move all terms containing n to the left, all other terms to the right

2n=142

n=142/2

n=71

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