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7x+4=(x+3)+(8x-9)

We move all terms to the left:

7x+4-((x+3)+(8x-9))=0

We calculate terms in parentheses: -((x+3)+(8x-9)), so:We get rid of parentheses

(x+3)+(8x-9)

We get rid of parentheses

x+8x+3-9

We add all the numbers together, and all the variables

9x-6

Back to the equation:

-(9x-6)

7x-9x+6+4=0

We add all the numbers together, and all the variables

-2x+10=0

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

-2x=-10

x=-10/-2

x=+5

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