3x=4(10,5-x)

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Solution for 3x=4(10,5-x) equation: 



3x=4(10.5-x)

We move all terms to the left:

3x-(4(10.5-x))=0

We add all the numbers together, and all the variables

3x-(4(-1x+10.5))=0



We calculate terms in parentheses: -(4(-1x+10.5)), so:

4(-1x+10.5)

We multiply parentheses

-4x+42

Back to the equation:

-(-4x+42)



We get rid of parentheses

3x+4x-42=0

We add all the numbers together, and all the variables

7x-42=0

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

7x=42

x=42/7

x=6

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