90x=400+30x

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Solution for 90x=400+30x equation: 



90x=400+30x

We move all terms to the left:

90x-(400+30x)=0

We add all the numbers together, and all the variables

90x-(30x+400)=0

We get rid of parentheses

90x-30x-400=0

We add all the numbers together, and all the variables

60x-400=0

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

60x=400

x=400/60

x=6+2/3

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