(30-3x)=(40-7x)

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Solution for (30-3x)=(40-7x) equation: 



(30-3x)=(40-7x)

We move all terms to the left:

(30-3x)-((40-7x))=0

We add all the numbers together, and all the variables

(-3x+30)-((-7x+40))=0

We get rid of parentheses

-3x-((-7x+40))+30=0



We calculate terms in parentheses: -((-7x+40)), so:

(-7x+40)

We get rid of parentheses

-7x+40

Back to the equation:

-(-7x+40)



We get rid of parentheses

-3x+7x-40+30=0

We add all the numbers together, and all the variables

4x-10=0

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

4x=10

x=10/4

x=2+1/2

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