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7(3+4x)=245
We move all terms to the left:
7(3+4x)-(245)=0
We add all the numbers together, and all the variables
7(4x+3)-245=0
We multiply parentheses
28x+21-245=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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