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-7(-7x+3)=224
We move all terms to the left:
-7(-7x+3)-(224)=0
We multiply parentheses
49x-21-224=0
We add all the numbers together, and all the variables
49x-245=0
We move all terms containing x to the left, all other terms to the right
49x=245
x=245/49
x=5
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