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4(3+x)-7(x-4)=0
We add all the numbers together, and all the variables
4(x+3)-7(x-4)=0
We multiply parentheses
4x-7x+12+28=0
We add all the numbers together, and all the variables
-3x+40=0
We move all terms containing x to the left, all other terms to the right
-3x=-40
x=-40/-3
x=13+1/3
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