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4x=7(x+9)=19
We move all terms to the left:
4x-(7(x+9))=0
We calculate terms in parentheses: -(7(x+9)), so:We get rid of parentheses
7(x+9)
We multiply parentheses
7x+63
Back to the equation:
-(7x+63)
4x-7x-63=0
We add all the numbers together, and all the variables
-3x-63=0
We move all terms containing x to the left, all other terms to the right
-3x=63
x=63/-3
x=-21
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