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-7(1-4x)=217
We move all terms to the left:
-7(1-4x)-(217)=0
We add all the numbers together, and all the variables
-7(-4x+1)-217=0
We multiply parentheses
28x-7-217=0
We add all the numbers together, and all the variables
28x-224=0
We move all terms containing x to the left, all other terms to the right
28x=224
x=224/28
x=8
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