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7x+3(-4-4x)=3
We move all terms to the left:
7x+3(-4-4x)-(3)=0
We add all the numbers together, and all the variables
7x+3(-4x-4)-3=0
We multiply parentheses
7x-12x-12-3=0
We add all the numbers together, and all the variables
-5x-15=0
We move all terms containing x to the left, all other terms to the right
-5x=15
x=15/-5
x=-3
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