189=102-x

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Solution for 189=102-x equation: 



189=102-x

We move all terms to the left:

189-(102-x)=0

We add all the numbers together, and all the variables

-(-1x+102)+189=0

We get rid of parentheses

1x-102+189=0

We add all the numbers together, and all the variables

x+87=0

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

x=-87

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