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-7(x-9)=-4(x-6)
We move all terms to the left:
-7(x-9)-(-4(x-6))=0
We multiply parentheses
-7x-(-4(x-6))+63=0
We calculate terms in parentheses: -(-4(x-6)), so:We get rid of parentheses
-4(x-6)
We multiply parentheses
-4x+24
Back to the equation:
-(-4x+24)
-7x+4x-24+63=0
We add all the numbers together, and all the variables
-3x+39=0
We move all terms containing x to the left, all other terms to the right
-3x=-39
x=-39/-3
x=+13
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