87=6x+21=180

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Solution for 87=6x+21=180 equation: 



87=6x+21=180

We move all terms to the left:

87-(6x+21)=0

We get rid of parentheses

-6x-21+87=0

We add all the numbers together, and all the variables

-6x+66=0

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

-6x=-66

x=-66/-6

x=+11

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