4x+3=87.

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Solution for 4x+3=87. equation: 



4x+3=87.

We move all terms to the left:

4x+3-(87.)=0

We add all the numbers together, and all the variables

4x+3-87=0

We add all the numbers together, and all the variables

4x-84=0

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

4x=84

x=84/4

x=21

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