78*89=78*100-78*b

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Solution for 78*89=78*100-78*b equation: 



78*89=78*100-78b

We move all terms to the left:

78*89-(78*100-78b)=0

We add all the numbers together, and all the variables

-(-78b+7800)+78*89=0

We add all the numbers together, and all the variables

-(-78b+7800)+6942=0

We get rid of parentheses

78b-7800+6942=0

We add all the numbers together, and all the variables

78b-858=0

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

78b=858

b=858/78

b=11

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