3(1+7n)-4=125

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Solution for 3(1+7n)-4=125 equation: 



3(1+7n)-4=125

We move all terms to the left:

3(1+7n)-4-(125)=0

We add all the numbers together, and all the variables

3(7n+1)-4-125=0

We add all the numbers together, and all the variables

3(7n+1)-129=0

We multiply parentheses

21n+3-129=0

We add all the numbers together, and all the variables

21n-126=0

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

21n=126

n=126/21

n=6

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