100-x=4(10+x)

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Solution for 100-x=4(10+x) equation: 



100-x=4(10+x)

We move all terms to the left:

100-x-(4(10+x))=0

We add all the numbers together, and all the variables

-x-(4(x+10))+100=0

We add all the numbers together, and all the variables

-1x-(4(x+10))+100=0



We calculate terms in parentheses: -(4(x+10)), so:

4(x+10)

We multiply parentheses

4x+40

Back to the equation:

-(4x+40)



We get rid of parentheses

-1x-4x-40+100=0

We add all the numbers together, and all the variables

-5x+60=0

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

-5x=-60

x=-60/-5

x=+12

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