3.9=7.4-0.5x

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Solution for 3.9=7.4-0.5x equation: 



3.9=7.4-0.5x

We move all terms to the left:

3.9-(7.4-0.5x)=0

We add all the numbers together, and all the variables

-(-0.5x+7.4)+3.9=0

We get rid of parentheses

0.5x-7.4+3.9=0

We add all the numbers together, and all the variables

0.5x-3.5=0

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

0.5x=3.5

x=3.5/0.5

x=7

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