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x+x-3+4(x-3)=27
We move all terms to the left:
x+x-3+4(x-3)-(27)=0
We add all the numbers together, and all the variables
2x+4(x-3)-30=0
We multiply parentheses
2x+4x-12-30=0
We add all the numbers together, and all the variables
6x-42=0
We move all terms containing x to the left, all other terms to the right
6x=42
x=42/6
x=7
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