400-3x=450-3.50x

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Solution for 400-3x=450-3.50x equation: 



400-3x=450-3.50x

We move all terms to the left:

400-3x-(450-3.50x)=0

We add all the numbers together, and all the variables

-3x-(-3.5x+450)+400=0

We get rid of parentheses

-3x+3.5x-450+400=0

We add all the numbers together, and all the variables

0.5x-50=0

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

0.5x=50

x=50/0.5

x=100

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