3(20-4)+21x=15

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Solution for 3(20-4)+21x=15 equation: 



3(20-4)+21x=15

We move all terms to the left:

3(20-4)+21x-(15)=0

determiningTheFunctionDomain
21x-15+3(20-4)=0

We add all the numbers together, and all the variables

21x-15+316=0

We add all the numbers together, and all the variables

21x+301=0

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

21x=-301

x=-301/21

x=-14+1/3

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