10(10+x)=400

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Solution for 10(10+x)=400 equation: 



10(10+x)=400

We move all terms to the left:

10(10+x)-(400)=0

We add all the numbers together, and all the variables

10(x+10)-400=0

We multiply parentheses

10x+100-400=0

We add all the numbers together, and all the variables

10x-300=0

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

10x=300

x=300/10

x=30

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