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x-4(x+3)=54
We move all terms to the left:
x-4(x+3)-(54)=0
We multiply parentheses
x-4x-12-54=0
We add all the numbers together, and all the variables
-3x-66=0
We move all terms containing x to the left, all other terms to the right
-3x=66
x=66/-3
x=-22
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