30=1200+400x

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Solution for 30=1200+400x equation: 



30=1200+400x

We move all terms to the left:

30-(1200+400x)=0

We add all the numbers together, and all the variables

-(400x+1200)+30=0

We get rid of parentheses

-400x-1200+30=0

We add all the numbers together, and all the variables

-400x-1170=0

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

-400x=1170

x=1170/-400

x=-2+37/40

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