-3x-4=8(7-x)

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Solution for -3x-4=8(7-x) equation: 



-3x-4=8(7-x)

We move all terms to the left:

-3x-4-(8(7-x))=0

We add all the numbers together, and all the variables

-3x-(8(-1x+7))-4=0



We calculate terms in parentheses: -(8(-1x+7)), so:

8(-1x+7)

We multiply parentheses

-8x+56

Back to the equation:

-(-8x+56)



We get rid of parentheses

-3x+8x-56-4=0

We add all the numbers together, and all the variables

5x-60=0

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

5x=60

x=60/5

x=12

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