87=4x-21

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Solution for 87=4x-21 equation: 



87=4x-21

We move all terms to the left:

87-(4x-21)=0

We get rid of parentheses

-4x+21+87=0

We add all the numbers together, and all the variables

-4x+108=0

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

-4x=-108

x=-108/-4

x=+27

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