100(x-9)=400

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Solution for 100(x-9)=400 equation: 



100(x-9)=400

We move all terms to the left:

100(x-9)-(400)=0

We multiply parentheses

100x-900-400=0

We add all the numbers together, and all the variables

100x-1300=0

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

100x=1300

x=1300/100

x=13

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