400+50x=1200-30x

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Solution for 400+50x=1200-30x equation: 



400+50x=1200-30x

We move all terms to the left:

400+50x-(1200-30x)=0

We add all the numbers together, and all the variables

50x-(-30x+1200)+400=0

We get rid of parentheses

50x+30x-1200+400=0

We add all the numbers together, and all the variables

80x-800=0

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

80x=800

x=800/80

x=10

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