87=21-11x

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Solution for 87=21-11x equation: 



87=21-11x

We move all terms to the left:

87-(21-11x)=0

We add all the numbers together, and all the variables

-(-11x+21)+87=0

We get rid of parentheses

11x-21+87=0

We add all the numbers together, and all the variables

11x+66=0

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

11x=-66

x=-66/11

x=-6

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