78=100-x

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Solution for 78=100-x equation: 



78=100-x

We move all terms to the left:

78-(100-x)=0

We add all the numbers together, and all the variables

-(-1x+100)+78=0

We get rid of parentheses

1x-100+78=0

We add all the numbers together, and all the variables

x-22=0

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

x=22

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