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4x-(7x+4)=-13
We move all terms to the left:
4x-(7x+4)-(-13)=0
We add all the numbers together, and all the variables
4x-(7x+4)+13=0
We get rid of parentheses
4x-7x-4+13=0
We add all the numbers together, and all the variables
-3x+9=0
We move all terms containing x to the left, all other terms to the right
-3x=-9
x=-9/-3
x=+3
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