21x+15=4x+100

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Solution for 21x+15=4x+100 equation: 



21x+15=4x+100

We move all terms to the left:

21x+15-(4x+100)=0

We get rid of parentheses

21x-4x-100+15=0

We add all the numbers together, and all the variables

17x-85=0

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

17x=85

x=85/17

x=5

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